Malicious PDF — malware analysis report

Static analysis result for SHA-256 664a2b9062b6bcea…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 21:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11459c406999374105326a3f8027b6d0 SHA-1: 4ad37afdaf412c03ec5574eefd0050f4cbdc0467 SHA-256: 664a2b9062b6bcea9fe9aee7c9c4c0fd1205e437ac5523654cc6a8c79da61135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=marketing+research+methods+in+sas+pdf PDF link annotation
    • https://webtechnocrats.com/upload/file/sezusimazilawewufexe.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/7281724929.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e4b7bdcb630fe31f0e8032bb7c7a67dd/tufaxeb.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lesuvukerenozinasekofu.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ftsr46g8sdcreuumatr60ee59o/69150414931.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/82791734806.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kegebikupakateki.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/bidoxewagevinat.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/37369970956.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7e916oe3rq93h30s7msgb6fe0e/3065695759.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/zuwapaliwabuxaxo.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf143152b---16565169200.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/j9gmfn30ck9sjreqtgr5jnfd12/5836011675.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5e5cf35d---59304205015.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57245bd32---gibesexigufixojupewew.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fac8bcf0241---fozojezeworoje.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/gagixevajudeg.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/38492654459.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ro61hl99jh9qkdftgfebjr3rch/31618870521.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/nuzibilumomazalewafam.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/df84f048d8b1c79793fc9d481f23251c/felugekazevivotizinefow.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 11104 bytes
SHA-256: 3c2bf50c05ad66bd647ec22a5017298b95152ed7a0e13b2917b732d3391f06bb
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 16580 bytes
SHA-256: 979ad428b23dcf447c96ae839e8998b3c6c7f97a7c37d453e7d70927e26dabff
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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