Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b769e96d7a6b874…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 23:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfda4af2df4b2bccbf49549ff9ce148c SHA-1: 363c2f4f7cec2c22c72f2528041a0c99dbabaad0 SHA-256: 0b769e96d7a6b8745b2b8f4d1a2bd152686dba53daaafc4f124c74e22677322c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=pokemon+go+coin+mod+apk
    • http://daltan.hu/userfiles/file/zisilexuwalebakamiba.pdf
    • http://kraemer-duennebacke.de/files/file/botukekelezifetudipik.pdf
    • https://dragonexpressml.com/userfiles/files/41131891076.pdf
    • https://xanbiente.de/userfiles/file/zamudawajafezare.pdf
    • http://rentaruedas.com/files/others/tigekaziwomitafadenedi.pdf
    • http://xaydungphongphu.com/uploads/files/juzozadozi.pdf
    • https://mamalight.net/business_school/uploads/file/pipedima.pdf
    • https://isagrinio.gr/userfiles/nefar.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/36433772156.pdf
    • http://seteo-dechets.com/images/file/87077783144.pdf
    • http://hyundainhapkhau.net/upload/files/fifijonuxuzajinebevitiva.pdf
    • http://xy-interior.com/uploads/files/202109152330439721.pdf
    • https://badeluxe.com/userfiles/files/79696687199.pdf
    • http://poliinc.com/upload/files/15562479905.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/pezekatadozonowebo.pdf
    • http://chongqinghaohong.com/upload/files/97697492000.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85a38a799---zifawereputo.pdf
    • https://westhigienia.hu/editor_up/48210498868.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/afb7cdb327452e6d7e0d300097f3b3b1/88883743449.pdf
    • http://cheapmarkt.com/userfiles/file/merazekidiwulisegugidarul.pdf
    • http://taiwan-tsai.com/upload/files/11331083685.pdf
    • https://nikolsbeauty.com/webroot/f/uploads/file/jonuditosotadisameger.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b28893e3---kotalupoweguwo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 16792 bytes
font_01_sfnt_off0000e0d9.bin
2c6ae9fc08179e0e33dd368286249144a3e29ea69ba47c175dbcac68761756dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 17980 bytes
font_02_sfnt_off00010f65.bin
77d3abbd16ff7a4545c05673483ff7328db663de544b1fbf8883c25b732b4d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 10540 bytes

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