Malicious PDF — malware analysis report

Static analysis result for SHA-256 61446e7b0d2f268c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 10:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 945311ded7e89073b0c37fe83a576dca SHA-1: 5cffc3d2842290bbdef4e33fa957ae2ab951bb52 SHA-256: 61446e7b0d2f268cd96a7db11501f75f4c655122e07a0c40380ab06b10a815cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to attract traffic and potentially distribute malware or phish users. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=hamlet+as+a+tragic+hero+pdf+download PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ac4ffa4c45e959246babcf674a065087/77015865771.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd53a6faa9---bigojosuko.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/91436282870.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/36538104727.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/8557551573.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/ladibademupisesugom.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/pitetolabi.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/mitakuvukebaruwugovu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/69268641616.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/mapape.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a171bea104---falosezoraratelex.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/4744363442.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160723ad28fcf3---tedaderufalurumewavaba.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074088a9b2ae---bumavota.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f18e8caf13abf521550262b1caf2c2f2/patis.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0e62300dcea93e8f3856577cac6a29f6/vopemovozejipa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa07f21583---tepujijimijikemoromo.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/94995765429.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/m41iv5ftr9ujtbcn8j01nehea5/73385267085.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f81e43c2---56821620292.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/dusagujufisitido.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/10851862472.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/6563166318.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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 18080 bytes
SHA-256: 9ecbbb4d9baff7c80d3a189b08d92b6caa4e331418897edf9dca1a13c9096c0d
font_01_sfnt_off0001187e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 11144 bytes
SHA-256: 0fe57f77cdd995622fac3ea29b4ad61c51c5b77258f5f6d140f1d6d2b304fa4c
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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