Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b35943e04bbd804…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 15:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63360525760defcfef8ac28d7282eb7f SHA-1: 5eacadd3b99fe9c096d8898ea83780887a1843ca SHA-256: 0b35943e04bbd804c08c8cd0e499882140416734d13b41445de4dda2189ef913
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or facilitating phishing attacks. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=married+at+first+sight+mia+and+tristan
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec1dee2bd5---zasalajorufukaguliri.pdf
    • http://dharmapremipariwar.org/userfiles/file/jawazowajojewerimafipuze.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/911e50c2e80bc2386bd19d58d4ed1a14/95640258298.pdf
    • http://extintoresorigen.com/images/editor/potikakukudadezodax.pdf
    • http://modero.vn/upload/files/gewatu.pdf
    • http://mlight.cz/archiv/file/628577346.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e415963eef---10966296876.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/pokodofatumabibadikapele.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d22c5e2385cc186e6d83e74cf890aa6a/85380586802.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/edf95nbfpm6i321jbv9atvmpbi/95293357207.pdf
    • http://myexamadvisor.com/fck_uploads/files/43991732470.pdf
    • http://savages.lu/imagesRTE/files/wanav.pdf
    • http://sun-tes.ru/files/file/89203186973.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ea8e244def71def4f5043c9a2065237/xiduzotofelopexijogif.pdf
    • https://maryamghiasi.com/images/upload/files/70906453749.pdf
    • https://szud94.hu/img/sajatfile/files/80532734330.pdf
    • http://farmaciafoglia.eu/userfiles/files/92790068385.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7de9c1188---16782188053.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/2017d240ccb870c1b34616f34f2854ea/jetagu.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cc0a425dc989638f4f2bb0e5298e3cd8/94577564348.pdf
    • http://fritz-fahrlaender.ch/download/92250964527.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/e2aea063c5b0c4294d3b1255e0130bc2/ketixomiwojezajitabaj.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a7e6e79e946cadcdb7159dc0d9bdb8df/87952581626.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e3.bin
8fb1a919db05f7a5b62404aff63810d8f663cf2e28adcbafa6dc1fcff1fb31c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 10628 bytes
font_01_sfnt_off000100c4.bin
18266da9665e3efd92eae1732f34f7c96ea70667785db2470e85389f6596cacb
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 18020 bytes
font_02_sfnt_off00012fe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes