Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c1b3236c86c89e…

MALICIOUS

PDF

70.9 KB Created: 2021-08-30 15:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfe4d6ef64693cacd8781ae0da84192e SHA-1: ebd28b6bd0c14fda508f185311f9f0a093e00be6 SHA-256: c2c1b3236c86c89e40ea9eba7440ad1883b0bc138226914bee5a984d68d94714
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. It contains numerous external URLs, many pointing to compromised CMS uploads or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, as these are common tactics for distributing malicious content via PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=animals+that+lay+eggs+in+water PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b63c0a6c647---43644238692.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/9998816836.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c844b82f3---86432418195.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc1387dce---gevilokiwugaxexudirinad.pdfIn PDF document text
    • https://melz-feu.ru/upload/33986665818.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dfjnphik8jt8coctn10rfke8v6/60711105150.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/38462088201.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb88921d26d---tusizurefawav.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3340947eb---17274196434.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7a9b9b6a15f2ce73e86ddc148c22795f/1970144341.pdfIn PDF document text
    • http://splogservice.ru/content/file/88860812011.pdfIn PDF document text
    • http://geodez.com/pliki/file/69400278058.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/lovezeja.pdfIn PDF document text
    • http://foxadv.net/file/22905819083.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/zalodex.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/denov.pdfIn PDF document text
    • https://andhimazhai.com/images/files/rosuxinebisex.pdfIn PDF document text
    • http://medi-sen.com/files/files/kimavitajikodoluguzigo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/213228dd465ca60763bf182a31781c0d/77993452935.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaa8d81da9---vitapeduwofavulare.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/50036996181.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609472d545c30---zojemixitowiguviwapuni.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_off0000b804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB804 14752 bytes
SHA-256: a8356d74d8f7688a9b417c552d86e83ddd2b35c9a59e87f738adf8cef4af8f69
font_01_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 10616 bytes
SHA-256: a0b63fa0cb000a2ba0b1248626ca31d19a3c315da2bfbae5e3df10431e732424
font_02_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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