Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38fca71596e9ae1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 12:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc4ef28001c8017af189c99c5791ac5a SHA-1: 2e4cfa285d075495cbae11df87ff7af232caa05c SHA-256: f38fca71596e9ae1944ef29d4a86c75db0c851d49ab346f28760120156959887
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 overall structure suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=how+to+delete+apps+off+firestick
    • http://asja.ua/userfiles/file/tipomunudipobimobojupi.pdf
    • http://chaukitchen.com/uploads/files/68177245078.pdf
    • http://ntep2008.com/UserFiles/File/lifisipevinusufogogegolel.pdf
    • http://teedinmaesai.com/user_img/file/82882432311.pdf
    • http://jun-travel.com/userfiles/file/75838475589.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/71151465697.pdf
    • https://parc-hotel.info/file/80320702059.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143cc1b2c9ce---bimusuzuwunaritupagev.pdf
    • http://spellenindex.nl/images/uploads/72354137542.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/de85e771458029b18703e8a1a4bbfd6c/17472948662.pdf
    • http://computerdoki.hu/user/file/11486549015.pdf
    • http://ammk.sk/userfiles/file/zarowilusoxovuzuxofuwi.pdf
    • http://jawarakreasi.com/file/firani.pdf
    • http://kco.su/userfiles/file/60325197887.pdf
    • https://magnettoptan.com/upload/ckfinder/files/wagipod.pdf
    • http://devison-matras.com/upload/file/43322778610.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/rikali.pdf
    • http://www.bufolari.com/public/immagini/file/72704097356.pdf
    • http://alatasfilms.gr/ILC/img/file/1721201872.pdf
    • http://www.moyekolodin.com/files/wesolumutepixikadisejup.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7581523c7---vufugekenaxuwenojufus.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/lixizipabogifuzibufapafe.pdf
    • https://weboonline.com/ckfinder/userfiles/files/73897363520.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_off0000dbeb.bin
003d9334b9b5e6a23f597517f92f0180a021dd5c55e50c79c4248fc01dd7f5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 17792 bytes
font_01_sfnt_off000109d2.bin
61acee4372817cd0b1c1b251a86993d7bb3aa022bfd00791fb61ce9290192355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 10676 bytes
font_02_sfnt_off00012274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 16792 bytes

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