Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f96e5ceddbafa2…

MALICIOUS

PDF

89.9 KB Created: 2021-08-07 01:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bd9a44e8faa98f7b38ff2a286ef2dc3 SHA-1: 4137bed7eaa2a2a5c781ad0a45ee29865ce95b4f SHA-256: 13f96e5ceddbafa2e11b59df8da4e94aba2466bdaf48a10f6a2e58299452a098
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress sites, with multiple URLs pointing to PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a common tactic for distributing malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c573f6873b8---fedurunizimetonuwalijofub.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fb32a37bd8d410f2841804407c890e32/5442092849.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2227f318a2119837db4422981eb29aef/33536170829.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/febimorokigumix.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e27ac503---faguponapewirudapijanewi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p7bvenands6pgj06t6oaguug73/2112203371.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7756edf98b2daf15c3daea1048ce9a50/4067973810.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f53ea15c62b---86359756629.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/zabejaroxuzubuwosoxusofop.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/bedobelidofe.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/26356835678.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e282d419749---mapeve.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2e05e6b285c428ba537d1a56aa26c6db/919335491.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/mamagenopidodanovaf.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/nopikere.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4f30a2bb9ed963f7809ab95632621ab1/rojamikaletugovaz.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fejudivegubifibafaxisuz.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5218c5fde---zesomasusulifo.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/69355376308.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/minowineporefoxet.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/46e4298a3bc3bb11fd25062a4f348f79/mozokazalekuxifezagumogan.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/48706767899.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b623e64daceedcc6a84f2a22ec766854/68195186779.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dfc9552f---lesuwowelij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=draw+pixel+art+in+photoshopPDF 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_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 17152 bytes
SHA-256: c81cc3230766a888434166f6db3920bc215b7438c79a6ecd7de42f881cd60619
font_01_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 10540 bytes
SHA-256: 3d0681be86281b9fbb3b9c0995c76cab9c5e3c1cd598d9faca7ce1e80711a293
font_02_sfnt_off00014181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1