Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c90d71fa84fdef…

MALICIOUS

PDF

143.7 KB Created: 2021-07-13 22:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f01c74e71b6917421541f3966e0d9edb SHA-1: 549341482f289a6402e661e6bd5f8a2955777750 SHA-256: 17c90d71fa84fdef833fc25da40645c96cd547d87893b298377930b1fa5c6960
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste commands into a shell, a common tactic for executing secondary payloads. Several URLs point to compromised WordPress sites hosting PDF files, likely serving as download locations for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/6857d5f81db259abe247d73a7c83d4b5/bijesapilexuz.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e7357ee4---sidafevew.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2de51ed6f285b485b6b88b201ba2a4be/mutalijinupata.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/62501151479.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/10f48114e835416ecab1558cc0009fe9/2107915759.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609841000e0a4---sujuvabolizujidok.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/fqlcfa56dkpu1imtcc230igqh4/faxabuwukegubuwiluxusad.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa23621957---pedevan.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/xezifivazonulovuxime.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087865e227d3---37783305772.pdfIn PDF document text
    • http://poorclarescork.ie/images/ninudebemeginitidesuwe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8d9d947690a43aaebee28eac697def4a/74248016291.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/60677513674.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c89c88f15---91016741759.pdfIn PDF document text
    • http://bjjiffy.com/upload/30329722361.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/89754239262.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f4edb964f3e90b8854732e9d08e89f51/zojetezeve.pdfIn PDF document text
    • http://meta-min.com/files/vigeregebozis.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/11393724781.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/jaxusuvukukuginimamudat.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/28118564450.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/922egalfl7nvuuv2k1brmqmeh6/lafavijoguzuw.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/zawamugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=insect+stages+of+lifePDF 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_off0001d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D368 10364 bytes
SHA-256: a6f39cc26847355610300b96d95149a9fa97fd1fe153529c81187bc18af66652
font_01_sfnt_off0001eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAEF 17708 bytes
SHA-256: 7739e5f9b92785eb2a689fa4b329f1b3a4ee3a28c984d57cad7370e9e5132c43
font_02_sfnt_off00021946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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