Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a4741db382b8d4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 09:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eaf9620d77b42bc725ebc71f0e5f944f SHA-1: 0f47c4a802ff89647ae833393881d22b3308424a SHA-256: 21a4741db382b8d4de481a9e2f26a45315b189e78cdff812269766488c06e793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or spam campaign. While no scripts were directly extracted, the heuristic firings and URL patterns strongly suggest a malicious intent to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=state+the+function+of+white+blood+cells PDF link annotation
    • https://textosolutionslinguistiques.ca/upload/editor/file/48048295295.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/30576835276.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/43570280175.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/jatajutilenafomipix.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeff38f0a4---38964541871.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/97735230505.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/60574480516.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/35597309265.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/batotuvuxujagejepu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kawurinunakeduponekad.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0qodiolj0ocbjhd09hbtamv21/55237232872.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9d6b7566---12035884055.pdfIn PDF document text
    • https://manenshop.com/upload/files/wisop.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/18364989554.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf0a208ed---93905564930.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/96575192854.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/35436618967.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/spjism8fmia4nq7h4ggqtqds3j/lulepunoxipixi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da636a72bf---34663358059.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a172ae147bda2318cfcd5ef6d05cdda3/fefifibarofujuwizo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/b2jqldqi83mdedai0p4k21fn16/lovudikogad.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9dc264d83fb3779f0642dd5f9bcef4a2/xisuzikidevedibe.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/vofuzejometixoruzile.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/zidov.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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 16780 bytes
SHA-256: 43c444621b1814a296254b69e9aaf66a473b40456fab756f72cb31d0f792a7ee
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 10876 bytes
SHA-256: b863e932b3d0f831afbc3f54d659e561d7825b0273041cfdb55a6cc236914f58

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