Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b9d99baaa3da36…

MALICIOUS

PDF

84.4 KB Created: 2021-07-31 18:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09fd4067757e4016b357ebeaf890d5fa SHA-1: 6f1efcde6eb51a9b6cc979f5549be70aaba8d5b1 SHA-256: e6b9d99baaa3da36f4cd15fd0f913832e852a502c8ac494b91229ff5b593f449
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and other domains, which in turn host more PDF files. This structure suggests a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=aiou+date+sheet+spring+2019+m.ed
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0df385b2e2---besalubigejuronofipiseji.pdf
    • http://michelschuurmans.nl/images/uploads/file/6573220692.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/40811422554.pdf
    • http://nhactheducthammy.com/upload/files/2624793624.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/86292009304.pdf
    • http://airsoft1.ro/files/file/98202484116.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4ad4fd1c9d230e8e545fddb72da5847e/31207692037.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf8e9dba53---xibomirodawijumebupuri.pdf
    • http://srub-servis.ru/userfiles/file/66966076364.pdf
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/1651123164.pdf
    • http://dioceseofniranam.org/userfiles/file/maletaragosi.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nufukeguperovamafolisek.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/bemejipipopijo.pdf
    • http://www.yoko-ono.be/images/userfiles/file/42341087442.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b03c1a14---49405433922.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ad96572b70d36e679e16bebe8b0e25cd/86663392875.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1463d5b20---89836412840.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf41b85ab---57095276866.pdf
    • http://ligneus.hu/upload/file/55439928053.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/5b4d87c69vjgmer53cm7u05fkd/risirekerexupakejukasuwub.pdf
    • http://ksnjl.com/userfiles/files/64223569747.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/97c67745eddd5bc10a88417522d63071/xovigex.pdf
    • http://afghansolar.com/userfiles/file/vefili.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_off0000e3db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 16792 bytes
font_01_sfnt_off0000fbed.bin
e0ab87bf0f8e0c96ff810482cb797a67476ce33b179936696e55c505cc57b75e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 17372 bytes
font_02_sfnt_off00012956.bin
79ead3385545a0f4d41c3af3bc4e1748e89d88552ff942779431d54918fcd520
pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 11404 bytes