Malicious PDF — malware analysis report

Static analysis result for SHA-256 97911b787f389732…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 18:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8aa8b9a77df904b4db9831e25f486b9a SHA-1: c7a6fe2c1d35fe0e0bafb695196ab937f4ee4f1c SHA-256: 97911b787f389732e72ab8643e353a3bcdcb62f8c1acbe1998059352aee9b772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=motorola+apx+4000+radio+manual PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62527451d---60247530921.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/wugajebirutumowomatafew.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/52507630196.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/biwumukekamukebiwebe.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/lumepi.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/47508922336.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/garusimeponefusarepod.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/65287178514.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/17530878276.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5781a2ac---tadetotizadagapopajixa.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/47606810041.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5393dbbd3eb66d573dd5ab35bc22c2c9/65347016216.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nevosagu.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/49329026691.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/dajufimadatekafotew.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/46265450468.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/kudadudatojal.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610361d582f50---fitomabusa.pdfIn PDF document text
    • http://tulga.ru/editor/files/8774252291.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2e50ca0fd028259c43740daa5223139f/sagowup.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9007a8603---juvevetutolim.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/12615874811.pdfIn PDF document text
    • http://didula.com/img/file/71540501723.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/5778847124.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/kajujebudidarifabejaja.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/87c757a7138f00c34881cc2622ceffd3/92281439254.pdfIn PDF document text
    • 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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 10648 bytes
SHA-256: 4130d1f98e5034f048ba270fc0094076a999232cf5b024f96d6d79fa049f4dc4
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 18568 bytes
SHA-256: f1b59323a975ab5050141219e15ef7af5d93fd90511065ebbd679b7795e0ef3c
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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