Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ab89f3da8c5940…

MALICIOUS

PDF

94.5 KB Created: 2021-07-02 16:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f556159dc194a57dd8c05f6405b4243 SHA-1: dfd4163cbc02528a3da4e402642d28b86c11cae7 SHA-256: f5ab89f3da8c59405dac2008addc7ecc047116067509a6a626e03b1090f3a3ee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5972d4fe2---motebur.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7ceb4757---zapes.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b681f9d4abb---nagijegilet.pdf
    • http://chayka-svg.ru/files/zefafezezeliwe.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f392fea0df---kilojubep.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e063a1718d509ead134fe0e061f7902c/xelomevemaxujazazas.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210617130713.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae981844d---21655492762.pdf
    • http://10glazsikeyrosa.ru/file/83035352034.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5oeq3l3v0ogg0i9k14uhp5ia2t/garij.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/xovasalamudifufafaxevipux.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c70732aaa---55030501991.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c69f43c897cd72229a58e79dbab752aa/saxujom.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/at56s8eq11bh7lsc4fil4p0c9h/73478741241.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ba68b602ec93602c4291efff6d6e84d3/rizujukapawadiwomuwegub.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ib6mkdfakrs1d5ss3u6s7bgdp7/samifinol.pdf
    • http://gramercy-grand.ru/files/file/xunud.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da6161cbd25---pisipidizuwejagibu.pdf
    • http://www.fonfe.com/uploads/files/xefavuzet.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3818aed8b7---vizixupiwozupelitotijik.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984da571833---30449512194.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089505d0723a---14876723224.pdf
    • http://straub-online.ch/userfiles/files/79487682296.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/60378825410.pdf
    • http://weberstellen.ch/userfiles/file/6557412142.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/49520096454.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=holistic+approach+in+tagalog
    • 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_off00010efb.bin
8c381d9f4ded4595112664c6aa53a1abda937f289faff6ecaf9ebcdd0a5e7ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 17592 bytes
font_01_sfnt_off00013c8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 16792 bytes
font_02_sfnt_off000154a6.bin
7fa90752d266625246a6de6271b5607ee83fc95e316a96a5db60b97061ebc68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154A6 10512 bytes

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