Malicious PDF — malware analysis report

Static analysis result for SHA-256 3164796962c20791…

MALICIOUS

PDF

94.4 KB Created: 2021-09-08 03:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dbcf76739f6337f1af006c47968a056a SHA-1: 94673e0113b3f18a9e10c995f67770130ffce393 SHA-256: 3164796962c20791a6a429782674cfc7a5431e24260570b2c7d5d86dce4ca05f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document that contains a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://etalentlink.com/uploadfile/file///2021081800514136.pdf In PDF document text
    • https://sbufficio.it/file/fopabipebi.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/30886594250.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///muzekujidigozakigusozeg.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/82ff1e9aada8441b383128106abb991a/35261767765.pdfIn PDF document text
    • http://geotersrl.it/file/fuwapofukotakidukogosopi.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/lemiliv.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2oru5elpj6fv12i65gtijv11qb/jodigo.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l9omvo03kvp5jlad4vq29n98rj/74036984588.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/winami.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/tabatus.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/9510790375.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160989425cc5d0---rifekezuguzuba.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9220186e0e---48760704934.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/bimanu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c21d3b6c9---43256908715.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/69426829777.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081111105273499.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/75260503258.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/90472267866.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/33771681950.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ef73f480c0649ca07fc779254c083e4a/74604138682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=oath+form+prc+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10368 bytes
SHA-256: 3897cb6f7b16790b54b9562bea03a22f10da7ef798cf336e1fc767980b20010d
font_01_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 20868 bytes
SHA-256: d76f105e857ce9bb0e75940bf047fdffef6372f8c0b0fb5330c00237d864ff52
font_02_sfnt_off00015440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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