Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac941977b8dd069a…

MALICIOUS

PDF

83.3 KB Created: 2021-10-06 19:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a571fd1394604b862150a8a58c67d392 SHA-1: 8f9878066cf0ef94126d1474235917dc3eaf0fba SHA-256: ac941977b8dd069ae33c830cf8c415f772cdf9e8fe95d1d910b4a88f19827cf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://yuanfuconstruction.com/ckfinder/upload/files/bidomabevikeruxagogumad.pdf In PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/danafujowolijefetogubimal.pdfIn PDF document text
    • http://p-energo.ru/content/file/tokoxowi.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/79294184893.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/12285538621.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/mafasubafekopaxiw.pdfIn PDF document text
    • http://insei.eu/userfiles/files/96536602653.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489376b04ef---kanaguxapafuralunarimos.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5hhch0nf05580kes4g9igln6s5/jupufiripiragenenutok.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/8055095584.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/fetetodeluvadi.pdfIn PDF document text
    • https://basisangka.com/contents/files/nubobadutuxedubixoro.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/79732535925.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ef1a0d0827c79f458306d2b9ecf42b3/91624080525.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/69080815483.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/22443422752.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/sewovapax.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/fisufi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/598e4ff54351e3ad3afc88d9cb2ab3ed/73050362649.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/068737a8dabca3e2f0a902f7c6a51149/84482413021.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/77991123986.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac78b92831---28192426719.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/85377793514.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/gokumuxes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=staff+performance+appraisal+formPDF 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_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 18724 bytes
SHA-256: d2a414f4b2c189fa4be470cb993ea3ff67cfc494e912764139319f96129c9069
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 10716 bytes
SHA-256: 15d8ed6e51e828d59774891828d45d89205c6c59cd1f95b2313963757b2a0dd5

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