Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49fbcc325c3af2a…

MALICIOUS

PDF

81.9 KB Created: 2021-08-10 10:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ac386068f7db5d77b81d9ba1318a7c95 SHA-1: cc61cb978bf13e910605b8947462ba391a28b418 SHA-256: d49fbcc325c3af2a2aa6b6a9a52e90c28bcb901fd10d57c6744be27f0ab3c161
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://ketchas.ru/uplcv?utm_term=practical+opencv+pdf+download PDF link annotation
    • https://etadelloro.it/images/file/loruzetowafetalati.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6k9dkt983dl8n91c19m9l1tf4a/88148039093.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef351b1c8e---82841234739.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160858bd742a22---dosisufovi.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084630f6d224---jekijoxumelal.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/37397975683.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/sarozida.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/52059981702.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/rujolurifefisoniw.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d486d988734---mozimofe.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfc0629b99---3198947677.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/suwivopekimalitorobaku.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1f6cd25d7---badixidivulinowobapefuta.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a58f0225682ad3a149cb87103e07f068/39134235396.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/67390765906.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8008abb461---66299145270.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1223b2a571---ronadu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/qj0lrtvu8cpka3j0i9d33tk4hi/zakolodabuvubobuwigejape.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/lekoxoliboxemufegafoxepig.pdfIn PDF document text
    • http://ridendo.cz/files/file/bapagil.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba936b3b5d5---lidukewidapetak.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/c50f40d630e2153d7837656e809ab966/23376192898.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ap8q4e28r0purqe8hbclkj6une/kiwelu.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/susisizi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081084165e---62824744456.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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10596 bytes
SHA-256: 3890c3079c5487879a9fa57c81bc18af9aca0d3e27dc80f2521a58481f379930
font_01_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 17192 bytes
SHA-256: c783adee18f7fa644e1c4ec6fa983fd8acdd60735185b86504a0e7ba5fca7ad0
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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