Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4578a17d63567e…

MALICIOUS

PDF

101.6 KB Created: 2021-07-18 23:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af758e4bef88c3612c0439e937782c29 SHA-1: 86528f9eabd0796bd72246851a3d57de932ad951 SHA-256: 8b4578a17d63567e9de63e2245251978e0bc6fda84c2ec555f36f63d909dd3e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, 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 distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beb340017aa---67301286706.pdf In PDF document text
    • http://rydelko.pl/userfiles/file/79921598258.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f5328200---vokinoridifivad.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5123c39b22---95240274357.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/fatefanasufut.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/50898761581.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/gekixanotaborodukose.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608948dd3b731---jifiku.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f4a8972e31d1f3123d93f925ee12d170/fikipatasin.pdfIn PDF document text
    • http://sdds.be/userfiles/file/89265461516.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/lenubinizalupegimoxupaj.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/jopovikevu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d6f1ab4a44558c4a14bf400deeeb3754/79096514402.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/70869674803.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797b10d7ee---85305400447.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d888fc56f11bf0d7c54edfe5ecec0713/53545033799.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/gewovefamurot.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/87c44e78810666ad1c264f2e604a0c8b/77450659894.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec69d3d02---96970343134.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kalixupirinamiruj.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6badc3dadee9d616ef829e137ed6e78c/bonerurobij.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/mibakobapebivimedamujaget.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/jemafo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608136e790e7b---56032068241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=elixir+of+agony+classic+wowPDF 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_off00012288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 10568 bytes
SHA-256: 921e40116bff35b117ba6da7a398eafc12a36e883a0f4eae8f3e6b07f4b5f627
font_02_sfnt_off000152e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E0 21476 bytes
SHA-256: ed50f2b702f2883ac9352ca1f4947db155542badb3399f1daa5f773f918a9366