Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf10c8449df8fdb4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 17:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2794ec2b2d1e47e3bea9c4a12f721e7 SHA-1: 9203cf30fc9aaedb2c079f3d248e42e344e7a661 SHA-256: bf10c8449df8fdb4d03ab4eb07deee6fd1e15acaa0099be8e76ff8d48d1bf84b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely responsible for initiating the redirection or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=watch+the+legend+of+korra+full
    • http://inbond-cn.com/userfiles/file/tozitamolun.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210910_B97160F8B4E6C8D7.pdf
    • http://morpheus-architects.com/file_media/file_image/file/nurubonitasadapamaja.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161360b3713000---zaxixuxirowegolu.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/719ab97dd23cacf1124fee013b5e0641/zifapakadekejamabeki.pdf
    • http://gaishachuukobuhin.com/js/upload/files/5236886684.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/67989e9679f807ddc9181fed9f1cbc14/detigixiwimizep.pdf
    • http://kryotherapie.net/neu/userfiles/file/97723226065.pdf
    • http://abwrva.com/uploads/files/vumetokodaderoja.pdf
    • http://msslink.ru/userfiles/files/11291555638.pdf
    • https://karaari.leaddeehub.com/userfiles/files/jidebofazebogipitakesa.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/xibiguzuxi.pdf
    • https://adamslakeband.org/userfiles/file/7599125468.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/67381227623.pdf
    • http://goref.ru/files/file/wegikavagutixifupimujiva.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff3d73695---71606127714.pdf
    • http://sochisushi.nl/survey/userfiles/files/50449768161.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495983b094---61480943149.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b680c1b3---64600116788.pdf
    • http://sfalojistik.com/userfiles/file/xuzejomagevisag.pdf
    • http://ebd.su/UFD/7623/files/dulewesajadabud.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/jefofezaragi.pdf
    • http://photo-ostrov.com/ckfinder/userfiles/files/39020163602.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_off0000e0cd.bin
c0179a9c432d9e4225a40199b831e223cd852f0ba487fe3073df3eecf1ac559a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 17708 bytes
font_01_sfnt_off00010f01.bin
05591c13d87f2069bc300ff3409a893d0d06136f4ed9683ef0df705d2d5a68b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 10680 bytes
font_02_sfnt_off00012750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12750 16792 bytes