Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2564ea21354707…

MALICIOUS

PDF

82.2 KB Created: 2021-07-06 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 04b674a99500307aff0d4cfb218e490d SHA-1: 528cd584e612a53478695a5a0cc83fc213fa2eb2 SHA-256: 2c2564ea21354707aa23d04b1d840dc0a5be0984de9b2abb1e1e0424c4bc04fd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document employs a social engineering tactic by presenting a lure that suggests the user must install a browser extension or update to view its content. The document contains numerous links to external URLs, many of which point to compromised WordPress upload directories, indicating a potential distribution point for further malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093d37366868---tafavowafip.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e93028314a---13508250010.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a390e8d75b3---zepazip.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/50404512092.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cb5ee451e7323692ad4cff3673531dc2/soxawafiduparuw.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/komagitutodimitidox.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8c97b44c834b2d37a0a7c007a9926e56/satudesovekosixidi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jeferodomelugoro.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a228594da5---kegimudojidame.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1ebd3191aa755e7c99a4b56ec7068ba9/wufirezevinebulowigegorob.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/m1hl435mhlh9p4fjub87rhmlp3/91804063833.pdfIn PDF document text
    • https://goldenapp.net/file/sunazisej.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6b8ad71ca199abf71a2004a2f3a43d44/jopiruwefajomijobexu.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/73993978714.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/jiminevipiwe.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/kadufedo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7b6e0bcc45997c3c89acfcdf8aa774fc/bufekorirofo.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ff71992b---41237877136.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607087c6398c8---zaxuf.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac205e978b2---piwokenuzosuza.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/wififozefolofu.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-1/20210701023230759964.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679be2f702---94733247378.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/19627606591.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vubozotafosulig.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/88023691165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=convert+pic+png+to+jpgPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10400 bytes
SHA-256: 024988b140adc00681fd4dcacc05126f9cad9f8cc0eaf93b5f83e42c0373cc6b
font_02_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 17008 bytes
SHA-256: 5bd2a9e384c81b57ca872c3a11de038022754e9a10baed0023d3e9da959b7a48

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