Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2d324c6d7d99bc…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 17:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4291b7000e07771d21a3728b478418df SHA-1: 8ba483dcfbdc7c3823ff349703b1d48179edcbf4 SHA-256: 4a2d324c6d7d99bcc8cacfe707ed5aad155c4258cfc5f13dcc9bf9db681be1da
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and compromised CMS upload links strongly suggests an attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://inwebjor.ru/uplcv?utm_term=filament+in+flower+function PDF link annotation
    • https://cristalensi.com/public/File/92041132563.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3be3eacf2e---29779817123.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a6a73c3b---zeniginisefel.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095e0d0f1c1f---39804282989.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8f8797cce16b9b986f0b482cffb438fc/86086672165.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9cafdbcdbfe5174d6216a23bbbde820e/fidodatorusevo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mncb8kk4ood0vkt901h466ra1q/wukisalanuxegobuwujo.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/8804533740.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/iej4pea9th746uh71o5oit3tkv/xelulujawagewukidukobobe.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa1e13db3---mixugesurorerikab.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d27c6209---kisotusetisuxamofomop.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1psdjo51es5glu1ivdnpj5l794/vanonizaket.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/faxaxutijemewa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6292d841d13eb8505f2cab704d0b4c71/davasofavat.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/57416941729.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/91a9ac6ceed80fd0754f066b9a37870f/74779808946.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777131c85d9---15880047564.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/97319060823.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607298b577f06---19897697713.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160755af89ae7c---9571999389.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/fivetone.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_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 2876 bytes
SHA-256: 8701bd0e90fec984654b3ad7ed58648073a8bdb182c8881194b41c47d3fba9a8
font_01_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 10492 bytes
SHA-256: bc908de6b27df31841e04f7b7dba773a3c5a93316b317fd979d2a415b655def4
font_02_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 17992 bytes
SHA-256: e4faaa52b9a30448a3137c57a9306f696ba25207316a9ac49e1b8ed7990bc818
font_03_sfnt_off00015b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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