Malicious PDF — malware analysis report

Static analysis result for SHA-256 643bdcb6e1517223…

MALICIOUS

PDF

73.7 KB Created: 2021-09-01 18:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0e869b60b1492e9c7f3b5c9311edaa6 SHA-1: 2f0e172b83630fb875dd03538153bbf825a5967f SHA-256: 643bdcb6e1517223fe138b48db7f795f0c6fed1cc09389cdf4665434bdbae5ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vfo4sbpuln5e6im1kbhue193v0/winerepevoto.pdf In PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/wujejawo.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/21074979883.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609112923238a---dalobuzonunuxiwufagisek.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3761ca1040---vatevatasovunokiwupeme.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16104aad0db0e7---pusaxomerafujisaxalivofe.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/4616948111.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/vekojuvowisuvomuwebux.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/55129236336.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/xubofutawotegezumaf.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8894c58a3afe170a43cf61b9e9945e96/58091452826.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f709f4b33ae---livijapar.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82c15251d---gepumusovowubipeligav.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608687310ead7---78813128866.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/19579868055.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/komurogejejomanifobugajak.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/26a2120f93f8f112ffac51b3fd256132/38978594074.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d80436d8---ginitututivixiniwupig.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/65973555840.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea962d61cea13acb221148b346911f11/5241400905.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/67624178301.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/60014271989.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b23ad6b812d---nusufidasuzuw.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/55485875936.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/lakepigibududo.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/65625522138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=merge+2+pdf+in+one+page+onlinePDF link annotation
    • 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_off0000c01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 15736 bytes
SHA-256: 6e33c9225aaff8dd7c2aa0140ed3f8edd92a4c5aa203aa8ebe03b6074cf2b034
font_02_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 10520 bytes
SHA-256: d4b16e969b1440153abd0d8d86712c89605bde6eb4b5466407b80ce04e066f4b

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