Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1d904d8cc000cb…

MALICIOUS

PDF

88.5 KB Created: 2021-06-30 07:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6884c5ae02ffeec8b4a9bfe603cc87bb SHA-1: 4e5d881f81fb94781160304f7ee81fd0d0e0269f SHA-256: 8b1d904d8cc000cb2ca4ec769fdaded9b6525aab3b69da36da8e19aa49767c45
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which likely host malicious content or further redirects. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to these compromised sites via a seemingly innocuous PDF attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/v7bd8294vr255jd2g20b3oaia7/56777661964.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0b904bed4250311ef8f1d7c412896aca/zafagizabejasuvow.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/94791841580.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6mb0fbalbvsvo1vs5ig021p07a/xuzimolezala.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac4a2f030---94860646758.pdf
    • http://novussiteyonetimi.com/uploads/file/74002677233.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b511f8a6575ffc304e545d72c8925392/fisesomukedo.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c52e1eacd55514694af272ac2dd5d44/4679733198.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b35b05a705e---12550773356.pdf
    • https://anhhuynoithat.com/asset/files/67443301771.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6b16e4b7---55493551437.pdf
    • http://geologocarmignani.com/userfiles/files/renadezeren.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cc8fa288a20f96c19410216a859eb2a2/84537736805.pdf
    • http://absigorta.com/E/file/zitoxalogowi.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/44405562357.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a6a33980---nirifokupukutijaxosiradog.pdf
    • http://blevy.com/ckfinder/userfiles/files/74361270705.pdf
    • http://jjmcp.jp/userfiles/Image/file/zawagufasavuziwidan.pdf
    • https://mertlakustika.cz/images/pages/file/firuwegilazop.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/97249601589.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d821028b2359e24ce5793a146a1bc71b/26279498095.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0jl4hrj9okir61ukigp19h7fqh/xaronerizukamanone.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=st+peter+piazza
    • 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_off0000f9b3.bin
14cb092b5d1635a8ccf889be560d3bbc208155b2060b2dc4df0c43e03496cd1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 17472 bytes
font_01_sfnt_off000126ed.bin
cf107ecacbd76609ee59055a44103eeb47ecf60913e27f54637325e60f388854
pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 9944 bytes
font_02_sfnt_off00013d1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1B 16792 bytes