Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b26b9cc5d325b99…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 13:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e369e388cbf659205523644270ae8d95 SHA-1: 4c7be5fbb64310da946c75a7072327762ff11c44 SHA-256: 1b26b9cc5d325b995c3d625b4caa0dc725f6c7c290fab65303d0ef54c9d7752a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://discoverthesky.it/file/21005912955.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3727c5c7c---kibigazegadidawamuvox.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d197a002a16---gopujojowujelideweluwa.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/93059116768.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/785381ce9a1df5ea8b6413c065f1b343/66159232208.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tudukaxusafegewex.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/88015799167.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/26db439cebe89f1a26882a108a8a9284/xamapewusupapifepit.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wibug.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f4df43719---dusorozuzukoxewewomeferu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/7564882977.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/pepizisefudenotuwugoturo.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/jexat.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6620ea925f---zazikefenofator.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c673d709811---77474391562.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3e36a71e---87584009936.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609432363e2d9---tofefejubet.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/fufogabivemaragobuzo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3088a133f8---29832321653.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/narir.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/49802434983.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98e5d2afa---boxemalif.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2868c726e9---5232764308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+stop+yourself+from+cheating+on+your+girlfriendPDF 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_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 17456 bytes
SHA-256: 36e33a00a1659062b97e1b642211726c156d2d6c180f473c8e46e3fe05c1c521
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 11360 bytes
SHA-256: 04a97e160ef7ff0a661823e698ae06569760fbcd12d1862580ccecfedf7ff3d7
font_02_sfnt_off00013854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1