Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff1edfd6ad37f21…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 23:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a3022edbbbf4e51ccbecd807f4c777ae SHA-1: 3726730bb50fbc9a1d9f54c20eac4abfa88741e0 SHA-256: 5ff1edfd6ad37f21a32ba1ab20cee8966738baeda25a527571baeb559bdb5477
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/uplcv?utm_term=pm+awas+yojana+mp+form+download+pdf PDF link annotation
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/26626dd6e0acb64020e5a61816ae3861/feliwakofeda.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3992627fb7---92182458716.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021060813032073499.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/5110070968.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca09ec0230---32971459495.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/ropaf.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/diaqr1ouli10dj5cmnuu3t94o6/wagugetisamegasozagefi.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/71746298901.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9fbe9b8d66f54dcfe56c627b955535bd/77745813519.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5e63289c892395660b94fee77c2ce66b/fasuriseloxefurez.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/zabefivosekolidovobameg.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/73744345977.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ad600191144---75296664400.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/964010783.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c345d157---voxevovexedej.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/49521757611.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aea0e8b3e1---mufojivedezajepumexegumi.pdfIn PDF document text
    • http://posuni.com/userfiles/file/budisaxenutifusefenaki.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea5a43eb3---sorabubunosebilil.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nveim23hab2ig0l48o0g5i6rjp/wefejogeseduzinid.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1bdd1102---87428567992.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/5757a966d663a2a462e04c8eeeca93a2/befozotesufokine.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/90528121388.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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 10668 bytes
SHA-256: efbabbda35bbaa372da7dbea2abebe0cd5014e17edca6d0a76e90be402f1ec0b
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 18188 bytes
SHA-256: 7fc9b0f2d8de71222c6cb17a58d3ba280b0a11b2ac6bef81efd9e9633ee1986b
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1