Malicious PDF — malware analysis report

Static analysis result for SHA-256 a233ed440b62af2d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 11:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea6b5548fb77452a4a1beb5a85d8b3b7 SHA-1: e5048c69a6afdf0711e49f1aa81fdce531170379 SHA-256: a233ed440b62af2dba91bd3f00300f29b88465fdc1069e8574347995f1c3473b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and a PDF link farm heuristic strongly suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://s8radziejowice-paszkow.pl/userfiles/file/90027910324.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/57846daa8e1c1b8910fa4b5221512bcc/jopesakexem.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/46485014498.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/96g90ap1bgh8f287dqk4v7dg7h/79584331937.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/sajud.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/19089900255.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/fivujetifolo.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/sosidoboz.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9t6bcf6f7an1ffbfqqjosj4i9l/nikanukezoguzorudama.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/fatixisa.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/50019722406.pdfIn PDF document text
    • https://ecoretras.com/file/molivofiwinuponuzesopawax.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/biotuvi7fsrtham9j5m510ksf5/ponezene.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/gadodowolesuxikewe.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607de818f0cf9---pujojamipetoparidufazalu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/47cd70b4f6f4cc785b731370021f0f32/37317644700.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb183b77f1---54341466177.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d17b4ec82d9019e636372937deceedbe/53239308972.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06cc389bd---meragun.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5b9a81ce1b7875ec84a6b322a3e4902d/lebidanitunine.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/56f6a3316510d7ad3554934f7320ab63/99127596181.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/dugije.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9473e6da2133ff6f4c88dea282ef1670/zimisaden.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/91169650591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=government+in+america+people+politics+and+policy+pdfPDF 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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 11000 bytes
SHA-256: f72d92fc5ac5660edccc19f1bb3fc37a6d17c3b9b360724c4535c408b21ddaa5
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16964 bytes
SHA-256: f64fbf96bfd8b6a7bcc7f8114edc244d4305aa0c55ed0ef15f3cc9006ad9dc9f
font_02_sfnt_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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