Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8009061c66637f5…

MALICIOUS

PDF

83.5 KB Created: 2021-06-29 09:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6b82c400e60d1fb9ea3dfd39d72cde68 SHA-1: 1697aa7cf0ec3036f66084ff772deb76bd5fd9b9 SHA-256: f8009061c66637f544476e63d7c88e9f4cba7195d52d695f7d28063b7e8808c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=woman+missing+front+tooth PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/a5bah85p8kjo69hvddi9rnbk5r/pasedomusi.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/51892307030.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08e3371e4---nebutezupowuvotobuxubowek.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0c760374c14f92096b52ecabd9b937a4/pebomuwa.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6d78ce5431b92bf084520445968619eb/40590799832.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a050bcccfdb---57685475466.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a0cdc6442063faf5485b234838496376/78719769858.pdfIn PDF document text
    • https://maturana.cl/upload/file/56813795941.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fn4r4ba7pp6facuh712b2rcmjk/17988695521.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/gumutosu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8565e73da5---74467873423.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1591df3b2b59150d0ecd698819dbab25/90406351794.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kb6ldlr269op0bec3qb88r0ihv/44979625426.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/19644060449.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/15184793647.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160943f9dd26a4---13839131929.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/s7t3gqi7u1bv94eiecvapcn905/xesuxojez.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 10476 bytes
SHA-256: d45a28aa5a705f1c9df67845f2945693f8d235f2aad851a69870550e5705d2be
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 17136 bytes
SHA-256: b71163edb27f6b61a36ea3ea1605103f84bedc963071803649f9df4d08267b3c
font_02_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1