Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f6422b1f3bb382…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 14:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 941c94aaa95484eedf3ea39d1e983c3d SHA-1: 7642b25f413908e85dcdade754a99bfb4c3b827d SHA-256: 22f6422b1f3bb3826b228463b96433141a983567968114021e4dbc8b2ce91f90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classification as malicious further supports this assessment. The document body is heavily obfuscated, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=osi+model+pdf+free+download PDF link annotation
    • http://toanlinh.vn/upload/files/50418078550.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/tutimovawilevidanozeketi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/41158440775.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/gejiwa.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/femixe.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/bufojadasowodimujuveze.pdfIn PDF document text
    • http://stroi-sistema.ru/img/votim.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/jubigusaburajig.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dec54369---dipax.pdfIn PDF document text
    • http://envida-nieuws.nl/bsb_website/upload_fck/file/43477777798.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/4965501637.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/68361735505.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/xipumubamibuzivepe.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/26619023065.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/vumimakasololisan.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6623aa764d795433aa56eec2ef95bd9c/5571774111.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/soxulozad.pdfIn PDF document text
    • https://maturana.cl/upload/file/vifunozijisafegiwop.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9884b81aa---18889629951.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/67367148212.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/panodatudi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2d80a4543c49d550c3ddafdaa2962b50/30529398981.pdfIn PDF document text
    • https://micsys.in/userfiles/file/mejexetubaxesukekudok.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78e276e55---22046127545.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e3diaj2dcb6bmq4jn587v88glc/dudolomozopawinal.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a0761e8f---waworuzepiwesagosi.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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 16624 bytes
SHA-256: f159c47f66e5f2cc9447f1228c316cdebe042372d5b2234ca1eebbb51108d3b5
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 10672 bytes
SHA-256: 3974216e50c664eb9c36ae9bd57023bd7899f81070b24466ce38b657ec21c64b

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