Malicious PDF — malware analysis report

Static analysis result for SHA-256 341bda81004b5cf1…

MALICIOUS

PDF

76.6 KB Created: 2021-08-03 15:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7e3757089ab946795c4d7112c3eb9a6 SHA-1: cbca530a685e7b72354c4ba65b130c5b0452efec SHA-256: 341bda81004b5cf1755246fa06e6f5a951740c1d961523d8ef6ab7c7e5697cb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to compromised WordPress sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://hak-al.com/resimler/files/80293202443.pdf In PDF document text
    • https://gadd-asso.org/userfiles/file/jobesoze.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/lixesuxek.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/guwiwowixegonitovuxugezoj.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e94109fbe49f03452c1c5efb002271b1/mafoxowaturevux.pdfIn PDF document text
    • http://fields-on-earth.com/4513490427.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c023e8dd32c---gizulenigagezironexoworug.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c949d55c011---xomapitabak.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/vujeworopanogapep.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693299ec94---soxoxekuvevukiwuvipikopud.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac309a32e02---fugegawenexabekusizo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9a0d5b51---kutifipirafoxataveb.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/jaduwoxiregaterukeligeta.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ce24ea02---nenuv.pdfIn PDF document text
    • http://emannsltd.com/userfiles/73028846322.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609277b67eef9---gafuvese.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb609db5b4---48158293150.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160824d967f686---86948107857.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/safuvupikasamag.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607701d6e5a1f---98303419726.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5e74a86f04cd090d3e494a15044e3156/pewutikegoguwumasiwevu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/95635215792.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/57875608683.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/83253844969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=humnava+mere+mp3+ringtone+downloadPDF 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_off0000c7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 16652 bytes
SHA-256: 81410d8078183c32181b7c0b7655de4e9e56ea5e919054ca0afaf7432e8ca415
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 10980 bytes
SHA-256: f3873933a5365076a1bcc2dbffb77253f06a362d117897b8fcc40a7b5b2e4ab8

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