Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9b9ebd82105c04…

MALICIOUS

PDF

82.3 KB Created: 2021-08-25 10:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25a103c1e05314473d1236346b079396 SHA-1: 987586a60072f2eb609730845bc62964ba8ad929 SHA-256: 3a9b9ebd82105c0465dbffd5296558030015b9d7d48c350351b25f22e6672fd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://archism.ru/uplcv?utm_term=pixelmon+mod+download+android PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4752827d9---visuromalidevuvufofuva.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c751885602---riposeru.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3e5745a54cd61cfee74abc8f8a31bcc2/87620023419.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b24305369---xuzaz.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/41964810382.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/55237728209.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e599f8b3---75449531431.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/fisile.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/vavikolofafewajavuzodana.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5fb266a5ed541eaf06bfe36a7c6edc67/14238722316.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/56581477394.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161219e4bdf332---sidov.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/67828236226.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/xobafitewej.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/g3amqckjoeio27i6ar3f640fa5/kejajotajekego.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/86925801026.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/7808100850.pdfIn PDF document text
    • https://asi-filter.pl/files/file/16172078640.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/luganudure.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb91a7b326---sotifitiwo.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/19542542107.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fukifabagodoxebonamiz.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/58533117068.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/50169162815.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/xedirasawakivewokeb.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 18772 bytes
SHA-256: 88be33c090876590308d696d8889b4108f81aad54c1658d6608e6a43e7e96228
font_01_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 2252 bytes
SHA-256: f6a9165ff81fcac992ebfa574775dc691d9a294a62bbcabde252cb460826c8af
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10332 bytes
SHA-256: 4b22a1b87f45f840b99893f29a27232f4a7314493405387e3403fe87b25f0957
font_03_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1