Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce28f5088e722076…

MALICIOUS

PDF

81.8 KB Created: 2021-07-21 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4a041ac70da0be49c3120ef25b961f0 SHA-1: e7f3bdf09b5d5866d6ff5f241aa95ca16a74ee6f SHA-256: ce28f5088e7220766b4f1d696f7ee87a978f93db0672dce0952ff173f2b251de
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/555b65079586162db9533c06222ed3cc/napiburigeradige.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a125f6cce60---95805596856.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/ximizegixid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991acc95f99---23591711989.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/bigemewi.pdfIn PDF document text
    • https://soechi.id/userfiles/file/90515346976.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/toxiwipomekuvodonevom.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/kigov.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/zalijokawogomufarilito.pdfIn PDF document text
    • https://faceless.me/userfiles/files/59812490134.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d33d9d0a5f5c682600bc902465c88a12/20455135630.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/be898f48178497889b118bf967ef805b/gewirafirofo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9cade5898---11538915506.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210516010137_027kgg.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/zijumurinosumi.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ce2949a07c6ef75b2fccf1ac5aa7cd20/ranesugoparatelizoled.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/nefusizonufamo.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/dudotisedetezomuzazo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80f79ca6b---90344660010.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960f233324---16445014814.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/68286537909.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7211c15a95465d9bd06d285449c39e65/buzojif.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/60491756741.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/vewabelodinamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=college+national+finals+rodeoPDF link annotation
    • 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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 10560 bytes
SHA-256: ac36d302d8dc96b221fca0eec9e6c53acf3f5cd98bf2fe40b4bfeaabce8bae9c
font_01_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 17308 bytes
SHA-256: c413ba9a1928545be4475fc30cab4af988cdbba28e8375f67c2383452cbaa669

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