Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f571ae79267bc76…

MALICIOUS

PDF

91.0 KB Created: 2021-08-08 13:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a77af32b38e092fe8606c53fd02a3e07 SHA-1: 45f1656e12e3c5fe2f516ef9a83147c465c78508 SHA-256: 1f571ae79267bc76a3f8456b0a5e6600661bec4d158fb05cb136d4b88c1f5a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+root+%D0%BF%D1%80%D1%80%D0%B0+%D0%B4%D0%BB%D1%8F+freedom+1.0.6+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4', suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+root+%D0%BF%D1%80%D0%B0%D0%B2%D0%B0+%D0%B4%D0%BB%D1%8F+freedom+1.0.6+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4
    • https://rabudiagnostic.com/userfiles/files/16571372150.pdf
    • http://bajajsports.com/userfiles/file/kemutunene.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/dusetaze.pdf
    • http://nousgarage.com/userfiles/file/98965764660.pdf
    • http://www.biotanika.pl/upload/file/tisipozam.pdf
    • http://alibabashipping.com/userfiles/file/pepujamujamokabetane.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5f18d9d8---28178625180.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818c898d97e---finevol.pdf
    • http://kowel.com/ckfinder/userfiles/files/1627440666.pdf
    • http://marinapogon.pl/upload/file/90033114159.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624301cd78---gozuno.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/224dda1808d4d69c2c64327946c78431/61086423657.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4afb7ea064---70393829897.pdf
    • http://pinxedien.net/upload/files/15639113065.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5pp8udtarthk3pej40341jo5h5/bosebeg.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/44573773365.pdf
    • http://kanizsakran.hu/userfiles/file/kufuxuromezejowezajivivob.pdf
    • http://rnralpha.cz/res/file/jadelewivadigere.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/52164173067.pdf
    • http://abroadster.com/files/65414954639.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c83b89d72---22890494441.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/s1m8rh37h5s2ho8j0nequfdpql/51645851827.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9037152af4f81c044d0b96b9072109c9/jitilopusatoxamixukifid.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8379b0a0---jilurixorel.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4175065bf---nisilanovogumanowifojev.pdf
    • 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_off0000e9ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 16792 bytes
font_01_sfnt_off00010203.bin
5e56ff238103acb7803e21250b9bc44665ec9403ffbc786bf0150cc2b1d69553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 11888 bytes
font_02_sfnt_off00011e1a.bin
eb19defaf9073f1c822cacf63677d7bc49c418f6d142c3452ba510fe21e2f564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 24096 bytes

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