Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac096a185f8d4d2…

MALICIOUS

PDF

83.4 KB Created: 2021-08-18 18:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc409d4d1a96e569ed29668587bd9410 SHA-1: 1e38dbdafe5e5e70fa3749d849333e8530147725 SHA-256: 1ac096a185f8d4d2503e88b558644597f68b820455ebcd204120a4bf9b4d208a
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 sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080a14a29664---74296321952.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeac794416---6765107526.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/79538382127.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/ragikuguletorefadiz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d612fc722d---mepew.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/pl46v24gb7n463sr37ol47vl0o/4878838715.pdfIn PDF document text
    • https://epiphanych.com/images/file/pijowutasufovux.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d1efa436e---32827004733.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b53f159e0---kofopunobijoxe.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/sopobufimitaga.pdfIn PDF document text
    • http://metallpress.ru/files/vomijefezuwexut.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/54080435426.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c27477a6eb98d89bb0e842d329e71d30/92597054826.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5bf77cb14b0ceb73602cdeb85b50bd20/98156982948.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/xabomaxo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a492e651620---55748496698.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8eaaaaa01705953cd8ab6e597c289aa8/4221060456.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/72772310081.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/dijeludujejofeli.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/948cs4v64q694n0fa45ktq4j9j/figowinoxividogeruwukeza.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/35672436446.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61a9ce6bc---ratifef.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n2eu74hv90s95vgcfgpg9fbf74/98901564101.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/xenemuxowibedaku.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/47464727603.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/82595909530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=delonghi+delonghi+dedica+espresso+machine+black+ec685bk+dedica+espresso+machine+black+ec685bkPDF 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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 11608 bytes
SHA-256: 0b798c83ccdda4b088115d02404663e1a0b15b5e9e29cb351279425a2e88162c
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16244 bytes
SHA-256: 69dafd1f357f02b5082f22fd3414e77d7e19c76eef5d07e015020ad57f4bb122
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1