Malicious PDF — malware analysis report

Static analysis result for SHA-256 785fd42d5c1944db…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 21:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3420f8a191c13449ae2e0867f693593a SHA-1: 56a2e479c43e618915d3c66607106edcf130aa8f SHA-256: 785fd42d5c1944db2b0930c3497d9c16bc15a8b78d505f04850f59b3a12bf864
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm. The PDF contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URI links and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mabifitness.it/userfiles/files/tavemosigibedowomotiw.pdf In PDF document text
    • http://mingzhicc.com/userfiles/files/50977888398.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109131306402676.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/tufijowuruxi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613826be0ba1d---kumorufowed.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96ab18d95---neputenefifafusajedikotug.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/poloseniwidujujakom.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/ruziwekadijetonefi.pdfIn PDF document text
    • https://artenika.pl/fck/file/25117302897.pdfIn PDF document text
    • http://saktigroup.in/uploads/safaferavefe.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/fexugugiwiwerufavebotiso.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/24963361527.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/11186245671.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/71c8a9580e65053bc0928e600425ce08/tuxemalenebol.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/dalagipupukoniwumumude.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/wipukibof.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/85979032044.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zemug.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/18330859392.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/sofon.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/31517441376.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/57871237234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=yt3+youtube+downloader+latest+versionPDF 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_off0000affc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 14792 bytes
SHA-256: 864b0d1cc803d684cdbb67dbe7a6db23bc497923f10dfbb6fceae83fb7ac2847
font_02_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10900 bytes
SHA-256: 84b90538c4385229f96498d00ef2919a0a556e4ecfb8f6c8a1a109fdfe876cec