Malicious PDF — malware analysis report

Static analysis result for SHA-256 266affe31ad2eb6d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 01:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eea175d43367726720d4bad59a9a17d5 SHA-1: 075b27ad09f760dd5a0c76cfb4157bce868566f6 SHA-256: 266affe31ad2eb6d05e4f0fbb37c3a7825c4d0834752d09e798e47b683a5bb94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gionggiacam.com/ckfinder/userfiles/files/57018893936.pdf
    • https://jiu-hang.com/upfiles/editor/files/zipujones.pdf
    • https://ibextrail.com/editor-images/71560880116.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/sogazaloxubowi.pdf
    • http://www.cddfct.com/up_files/file/27174027350.pdf
    • http://snieznik.pl/userfiles/file/94198997867.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b02425c31e---83130123856.pdf
    • https://saunadlaciebie.pl/userfiles/file/pobojobugagipejes.pdf
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/48911624386.pdf
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/1394025495.pdf
    • http://mega-treid.com/userfiles/files/kopinuderolodom.pdf
    • https://mysilo.com/upload/ckfinder/files/30844192643.pdf
    • http://logenamerica.com/userfiles/file/80788989613.pdf
    • https://snqrsl.quebec/upload/editor/file/30131737316.pdf
    • http://delifarm.com/images/file/73736142414.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kh73e8vq2tfivb9g63sc077as3/kunakefemigoguxuxu.pdf
    • https://akilanews.com/ckfinder/userfiles/files/13380212337.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e860818df3---84268403111.pdf
    • https://hw-power.com/uploads/ckfiles/files/613a83f54d286.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355154304bb---61277083686.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/66759291481.pdf
    • https://armature.ir/cache/fck_files/file/xosadubesegerawukutixew.pdf
    • http://futimisdev.com/userfiles/file/duwaw.pdf
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/58910292701.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ps4+emulator+android+games
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b13a.bin
edfe007fa0df99ef01eb100e0f14fca0a13b80c29f64a91a481cb90ce062cfe7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB13A 17696 bytes
font_01_sfnt_off0000de28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 16792 bytes
font_02_sfnt_off0000f63f.bin
ef502a521076dd944f0c6e7c83f8b216f526fea104358494936d2c5aa8177e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 10768 bytes