Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10c66963ea7ac8b…

MALICIOUS

PDF

97.9 KB Created: 2021-06-28 10:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bad69bfec19717f3ebd3911d44f0b65 SHA-1: f0dbc287882e20bc48a4389b1cf8aed568dafe55 SHA-256: b10c66963ea7ac8b1f2a9b8d0574634e9fe91d4c238f64df21b2e5360c74e13b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting it's used to distribute further malicious content or lead users to phishing sites. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://allytemp.ru/uplcv?utm_term=meaning+of+tetrapod
    • http://thayloilocnuoctaihanoi.net/upload/files/xawetirefedigaxuk.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7a6d9dc75445f3903554abf01c22e8be/61819565939.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/15621236270.pdf
    • https://addsfly.com/userfiles/file/wigipomoxasebu.pdf
    • http://beachfirebrands.com/userfiles/file/77456251677.pdf
    • https://ilmercatinosottocasa.com/file/tawokubosavebawafa.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9d9547e3f8e5a3f431cd8daa03a24908/97353034904.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335a803697---94056017819.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dc0b263da2d5d8d7208b8e8c20eff923/64889762245.pdf
    • http://sattosushi.com/uploads/files/dunizefudow.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e4c82f42---75434408926.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d033dd2416c0068578401fd88e5144fc/35233837790.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/1c43fcbbc66720af2153d12ec699f387/weloputozagivujeguvo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0093f38269---bumozonun.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425491dba9---pajugagek.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5b0mqbt1ah0i7pqbr0g9rhm313/sanovamamakenonanuzeboti.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/56d334366218b97bcca51b328cb812c9/7840222478.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/a1e09df442795754387890938263205b/mujuxumiwunutusanijoxiba.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/db78b12a39c8f769ee9beec4f8ca7af9/95020098361.pdf
    • http://andlupa.com/userfiles/file/fekexa.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836698f30d7---33955147315.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uhi2411a0olh466fiiakbjtrh0/25494573824.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922d1cc51e3---42463291883.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6d6a0667ba75dda5804ac1197bccbad8/29431504482.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_off00011707.bin
67efd5620e72c3cf2e454957bb9a4fb07055e46fbfbbcb6f419bb16e9c79f048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 19768 bytes
font_01_sfnt_off00014aef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEF 16792 bytes
font_02_sfnt_off00016306.bin
8a90abc937e6fecfcb742f384209ada0467bf0c54fcdfc13d63d11dced9f071f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16306 10452 bytes

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