Malicious PDF — malware analysis report

Static analysis result for SHA-256 8636d1c59ec4919a…

MALICIOUS

PDF

96.9 KB Created: 2021-08-11 10:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 578f650a58b6d00ae87b60c8e4d593ac SHA-1: 9a7cc9966cd26abf276c875d575c4fbf53abe571 SHA-256: 8636d1c59ec4919a4936dcfdde3f8b610ff715ed9c5c86a8d809db619c5254ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress upload storage or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure suggests a link farm designed to lead users to malicious content.

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 http://clinicaveterinariasangiacomo.it/userfiles/files/25615555052.pdf In PDF document text
    • http://egca.fr/userfiles/file/65102229813.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/rokixarugelimutiku.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/kalotoxulibinaj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db5cf6c97c72f2aeb61f0aa1dbb04b2f/tumowekivawuji.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/tijugavifede.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6de5e47801---90424277512.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6ef4a463---dalipulojomezazesabotowuk.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830891c4b83---zobidudoreziwasewoluzu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/280d43fe92c5a1392d9013847e5383df/50517353038.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/13849352220.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/zejuropexojazukuburuwofoj.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc3cec770---94239037612.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcbae17633---xevopikizuko.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/lifobazudi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c30483c9---23630667012.pdfIn PDF document text
    • http://surtek.biz/image/files/20150102_034500.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/todugegoruwizevin.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6cd3d9b41543393b31e4756597a9816f/wakolixuwidano.pdfIn PDF document text
    • https://webmenuplus.com/images/file/99088996041.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/gusokemekar.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dad281aff---74375484352.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07ce76c61b6369bfd704a4965ccd6375/53273187086.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zifufikoxaw.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/619dec44bc6eaddff0b374874eba645c/24018911145.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/86499285072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=colorado+xts+pontoon+boat+manualPDF 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_off00011439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 10704 bytes
SHA-256: cdc4259280d51bdf552d47ebab4378b87b33dd1d93d8a6ece8db767d6ceb314f
font_02_sfnt_off000144a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A8 18316 bytes
SHA-256: d281abeb1673e25f12ce232b6d9756138885cc397b1411be7940009f34afaef6