Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb85d9f81c3fcce…

MALICIOUS

PDF

82.9 KB Created: 2021-07-25 20:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7685ccf1a84948406f272f958d20dd40 SHA-1: 02e63e1d10de11ae466df19ead09c6c1a78dd6c9 SHA-256: 5bb85d9f81c3fcce245dd9843d32ef20d5f9ada82a3e03902fafd4d13c6267e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and embedded links align with techniques used to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e58672592d6---20484404064.pdf In PDF document text
    • https://datatech-int.com/userfiles/file/zirubobulefedin.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/46244133258.pdfIn PDF document text
    • https://sambelteri.com/contents//files/79613951735.pdfIn PDF document text
    • http://houselandia.ru/files/15101775213.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/65195479262.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/tukoravip.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ccad5a4d1---30701645168.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ae043135---jewurubekolowozo.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/47249235086.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7h5k9gh7cpdocbb5fjsvm7u70t/gelupunofurijukuvagodebi.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/29b2ef91b2965f2c64e3b7c1d883abc4/10154974644.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dv3phm59nq9jquhf1loaqrd0f2/84578352172.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/91976783629.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4675e4e868---42564935699.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099c9fe25070---63441724360.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/napurenulureliromol.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/60612906466.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d44edb14f---wijawuzalakojewazi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9a56946c---46186291188.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795dfbe984a---navumoremulapanofuxo.pdfIn PDF document text
    • https://promise-land.com/upload/file/fuxapotat.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/edae4f342d0577efb5ea22cb51398e5d/kavofutipurawuwefoxuz.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/65855550729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+questions+are+on+the+driver%27s+license+testPDF 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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 10804 bytes
SHA-256: 7bf7b68336b5b98596077ca28dd26a6346a12d0cda71419587c17d28142ff366
font_02_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 16448 bytes
SHA-256: 9ba9f3d5801c26f7e4fd49ed815d57e05864cad869e212b2d587fef0a3a64c35

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