Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a2723749d55d73…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 16:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97c2591d42bd370473d3257e214f1cab SHA-1: d6dfd3bf57aeb35a9b485dff81a4c3acc5369e4c SHA-256: d2a2723749d55d73b4ffb5cf07d06eb59b8a41893f83a6748cb22e43c2e6425b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://actorconseil.com/files/file/besenekesigagumunu.pdf In PDF document text
    • http://momsystem.ru/public/file/42580118714.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/32133233264.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/10624334570.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76531d9021---53785668418.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/matebopavisebogepowesujib.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ebf70e9cb---57752020557.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f82a11d3514---15206980170.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/60239743196.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/sowajozubuf.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/bezulat.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/ruzizeguji.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fd85e1f03---47902625162.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tudiweridukufijironuru.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/08c343d4538dab6577af00c5154b774b/10745115330.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/86ifvd89oquep265h27d5sv885/50932987420.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607256dbaa4c1---73461825909.pdfIn PDF document text
    • https://marigabung.com/contents//files/tadofasalewupu.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/najeruzijowekevegem.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd2d8739d---49257901852.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/21842674126.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cbfbf32f7---268870674.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/44114593986.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef450b93dc---15508896196.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4762a2c94---68098972440.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/87647259666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=civil+engineering+reference+manual+by+michael+lindeburgPDF 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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 10988 bytes
SHA-256: 0bb9bbb3b61339c4e0241641b53c7d5917082cbe34df6b314da01b2d0c1ad25e
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 19576 bytes
SHA-256: a20af4b6da74c66732a72ac2db0aff150e8a5e4a671907e46cbed6a526d76397
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1