Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e316629918c236…

MALICIOUS

PDF

140.5 KB Created: 2021-06-10 16:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bc912ab9a3636600726f45a3c6c477d0 SHA-1: 40a457f9531d156294ed5019e5dfb56b03d539e8 SHA-256: f3e316629918c236396d6aebd567a41dbd413e60debffc4afe8de51583bd8f6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=transformers+dark+of+the+moon+autobots+names PDF link annotation
    • https://amursvoidom.ru/media/files/79797970116.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec688e67c---jovipuwul.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/50609004866.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beda3ede03---konov.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b5cb797c---kotadudidunozaxasuzofik.pdfIn PDF document text
    • http://mamam.by/upload/File/file/gepasurex.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/624689b28bf17c5e1277f2f012d7f76e/jajek.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be32409f4---tetinakufuwudigalituzoj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b1696dbb0---veratolawuvutekufebogo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0iq7svo15ep58ojf1ihdp6r8e5/39990837845.pdfIn PDF document text
    • http://cy2hand.com/userfiles/biliwiriwodorase.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/dizajug.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d350595c9896a8d779a10e3ed1728a9d/20925152140.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ce2ecece---benolid.pdfIn PDF document text
    • http://www.bandungmesin.com/file/59963066811.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/babatobaxodujuwuwulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA0C 5268 bytes
SHA-256: 0a4dbcf097cdf2198609167e52477a687881e16711faff087cf4784148844ec5
font_01_sfnt_off0001fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBC6 12144 bytes
SHA-256: bf35b7a79df5a79efd44dcf8aa98a1181c6d04f9034602039509210972331cf3