Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09c5a806204ee49…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 13:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 4e552da51aa76e4a9e9f0ab51d3a04d6 SHA-1: 04285939099cbd0ba74cdfa7372b52bf58ac7aed SHA-256: f09c5a806204ee499e3d0af05d6533a206d603b23d9675cdb588ebc055c170cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pixomot.ru/uplcv?utm_term=how+to+create+password+protected+folder+in+android+phone PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7c90c2cbb944c81fadecc7bd8d7e39f7/defurikuwupinapo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d73df2270---lutapivaximufirixilolix.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/49581921830.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/vojeru.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313e516c42---11203076730.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/voziwalamupepuxe.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/kovagolumakonutiki.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2f8c5400---10281652212.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/rojitupazunevomemajeki.pdfIn PDF document text
    • http://deltools.com/userfiles/file/vosogige.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/viwebidi.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/60920777720.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/juxuwo.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/bipizarew.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210909_003753.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/090719282960.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/masuvevukosapadogu.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/fukuzabosigidexato.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210904123052.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/83201823487.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/49160794880.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/xawasetexotudazejisolaso.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e3ce06e8---78143923750.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_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 14844 bytes
SHA-256: f358842ce2eccee635a7dec1f56ff8ab3e6cef47ce0e0af296ceb4ae02d55103
font_01_sfnt_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 10796 bytes
SHA-256: 9341654cd4b6af9ee030a9f5c79a0942bb23301845d6038bd4b20b35e8c8db1c
font_02_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1