Malicious PDF — malware analysis report

Static analysis result for SHA-256 482070de54ff43c4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 22:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a07acda1e95c38b0cc3ceb1dee6163b8 SHA-1: 74476b4e6d1675e7a65d9e93270215ca242e1028 SHA-256: 482070de54ff43c43dd49585a93c355030467013a5a3e578b5356b2e95ffa331
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://roycraft.ca/userfiles/file/kafusilitabo.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af017dedb---53672421050.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/49824050462.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4203dcdd8e---3644359709.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/kigamunun.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0d80ec47f73a9c0203958bb784afa329/53315308468.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd20ce8f61---62816816952.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c675b88c2892e1550d073aa7dd9d9aeb/33126347247.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2a2f78923e29740999bed0c75463b0fe/bofok.pdfIn PDF document text
    • https://ratosatu.com/contents/files/72311260760.pdfIn PDF document text
    • http://bamila.vn/luutru/files/melasanadakodududulo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bogd7agncdj9j36u03rtde5vmj/38977708918.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/48130014537.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/dukuzaverepuziw.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091048e0fafa---77005968535.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vuxuxinesokawesobasuxelis.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b763254d---mapexopurojetuj.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/33845394485.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bbce8e5d---80904940860.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210607105725.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/70994906329.pdfIn PDF document text
    • http://vecsecity.info/editor_up/71632620141.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/96953067224.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4on3qrrms5fksnf7fqgu7mubf0/kisusomokuranimapepofus.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608458ef4bc88---mufisijafozoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=combine+two+pdfs+readerPDF 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_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 17828 bytes
SHA-256: 9c3eb5a6c5e87d541066bae73bdbb3fdcb8c55633393e4c1a92438f4f88a6498
font_01_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 10868 bytes
SHA-256: 587461fa3062179b8704f90b9f6e2fdf48df48c2905735f0b5dcc9cf5ed99020
font_02_sfnt_off00013241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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