Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4076c370a487a0e…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 12:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c12a51a15d418279c3449e5927b961f SHA-1: ee7d1fabb970b4b9736df80358ed30a649ea3827 SHA-256: d4076c370a487a0e43733addaae5f48e9b73fefb81c010b8646719a5dd20c1b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1c9dd4c3ba617ed838a04cf910ca1277/temutigadoxa.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b65dcac41---vogigisiwawifowiruga.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f8726133---kulewe.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aae163165ce---gevozob.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072e16ade4f8---kotatopit.pdf
    • http://edu-family72.ru/content/images/uploads/file/19627002973.pdf
    • http://alfavit.tv/userfiles/file/43098961342.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8km8u92n606j766p8r3bhjp3f8/lebegemob.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090412d56e16---57737796691.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3241e7a36---85798007279.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3q1or558i01lk5a4888etbq2qm/jebalinaviw.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/c5d99b1b55cb2cce1caa35648f2dbccb/guzefale.pdf
    • https://noihoithanhtuan.com/media/ftp/file/ruzamurezusunazepido.pdf
    • http://fredericjean.net/oplusco/file/jokosefagesuxa.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160895368b52f9---12501414461.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfee1ddafc---wigimokotibal.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e3958b168ae266da8714b283afa4ef4d/43801894947.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q4kbgcvrphn0q6qarohceo7kci/tufaravogufopilowufa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=zelda+final+smash
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3620583ed---folutupera.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f786.bin
b5ca3f91540b46628d93b9e9479d5d91cac95b3985e7e72d2da124c3a50b1155
pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10264 bytes
font_01_sfnt_off00010e48.bin
474e0220ee13bdd04df2d22e5a4b7ba91473849dbc3211053b5e400fa41a36ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 18280 bytes
font_02_sfnt_off00013ecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 16792 bytes