Malicious PDF — malware analysis report

Static analysis result for SHA-256 7271c3c3b86d773f…

MALICIOUS

PDF

96.5 KB Created: 2021-08-08 10:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cc45258c9bb0ec5a440b8088945cc9c SHA-1: 76e90119cfc4f4ff0f348115420fd015c9e39aba SHA-256: 7271c3c3b86d773fd50628c255e4f35fb79c8911eeaf78aee49c5920ca9ead1f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of algorithmically generated URLs and links to compromised CMS uploads. These findings, combined with the numerous links to potentially malicious sites, strongly suggest a phishing or redirection attack aimed at users. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • 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.
  • 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://ateliergermain.net/sites/default/files/file/31153038114.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512012133165797.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bapigamixojuzemet.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s9nnlbimgj4oigseeue1l4d681/masaxataji.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5641c3dac10a1f6c69727cd60eda90a7/77231433700.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/97108304346.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a88e255f3---81258585535.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100b18c3c4ea---13378207379.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/83048411394.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/povixamalanu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c36e3361f8---bilaxabawususomilonu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d04864932---44320467838.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8465ee4a8e---silulalenovekolugux.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c948a56ddf4---72134728447.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/213c3be555d2b601bfed5406cbbe8bef/jokak.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f5925ccf0237f54ef7b72851d9db996d/58976659218.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/dca9223986d8abeee3eb0829d90b8420/judumegekitir.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/xosabu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///tamadaziwefonin.pdfIn PDF document text
    • http://yoron.net/up/files/pedunevirapuliboseju.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fb52ec856f5821bf3759df07ec623f55/vemurufosopur.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b531d98cf5.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/78856766.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42dee9e9f---lemimariluvuwilinamoba.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/zuperiziduxiwuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+5+nas%C4%B1l+indirilir+ve+kurulurPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/59171750875.pdfIn PDF document text
    • 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_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 19404 bytes
SHA-256: 64bc0b9246caa8c2a1432077d89b64ecbf9ccf82a6b1a38af58570591185fe8a
font_02_sfnt_off00015898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15898 10596 bytes
SHA-256: ddc49a2b338c1edd0785f35dd8ac1406cef104f97d01219689fb9305f3c2ec3e

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