Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3b655f7447b6b4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 17:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 365b3e0d8e34255eb46e88dc4d80f754 SHA-1: 568e2b66bd0fc2f87fa854ff0d312376069bb114 SHA-256: ec3b655f7447b6b4749cf49ecdf471b266bbb3eadb53920b2a4a1171300b34f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pooq-design.com/app/webroot/fckfiles/file/dadedolasuvinisuvunixigem.pdf In PDF document text
    • http://sungsam.net/userData/board/file/21546625569.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210625_65BBED6C33457244.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ccd4b162---69180669240.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67e1e4bf92---mugapo.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/52821530152.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/wasunidamifamadupowujiro.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c05486b0f---bikek.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2262918f98675eca21d21f7f8e2c211f/60298483356.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/nogiwowapaleviwut.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8k1e2lbat9bf6ifp4dlsko9h5b/37793085034.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608757cd43e91---97501622375.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/lapuwawaniwulamoj.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pugixigilejoroxuxexuvut.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/witon.pdfIn PDF document text
    • http://willbramephotography.com/regetilifulafolisugonaden.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gedurexanize.pdfIn PDF document text
    • http://pk.mo/userfiles/file/27868985603.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a7cae4a78---60320228545.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/gibonolaxu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/4e242b177e113c5b30b96e88c3641c83/ralulelusenuzo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a65b0b8b---32841407727.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/69441709419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=indian+economy+by+ramesh+singh+10th+edition+pdf+free+downloadPDF 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_off0000b57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 17572 bytes
SHA-256: aff92483da6a514509aa09cc47f6b5a2aeed00c7dfb5a951e16e4596224e78a7
font_01_sfnt_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 11532 bytes
SHA-256: 2f97f31b3f7e70ed96242a668ba6ba64b44201bd20e6c09ce6d11302bafd8e57
font_02_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1