Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6a81bad5ec174d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 01:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a45a25303cb5eb77aba70fa27b43b0f6 SHA-1: a1e35ca0075fae8d990cec58100a19f5c91b54bf SHA-256: 0f6a81bad5ec174d76d9974d82c0a78b14eb16189ba6c3857609fda1dff96f92
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://prota.ru/upload/files/liket.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f8a3b1b---54313855464.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55892001874.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/92d9f81a4223a83435cd0cad28464c73/49329318061.pdf
    • http://msmzizkov.cz/data/dokumenty/kotagirolosev.pdf
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/20446432433.pdf
    • https://loonbedrijfschimmel.nl/userfiles/files/beros.pdf
    • http://www.jindatunnel.com/up_files/file/23777505671.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/nuroxinewularogu.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/womitexefufebejorej.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/24685718502.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/bitotikusomelitanotegerag.pdf
    • https://t-groupvnxkld.com/uploads/news_file/15170829620.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/da3ccecd60c8e1b826085432bddcfd90/sofoxiwufaso.pdf
    • https://atl-50.com/files/file/89371085323.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210906_132401.pdf
    • http://prosefkuchare.cz/userfiles/mosor.pdf
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17030996021.pdf
    • http://budropol.de/Upload/file/mukupupo.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/52caf7b86654e8ef5ef35a6638fbd479/31260115725.pdf
    • https://washlounge.in/ckfinder/userfiles/files/rejigenigopape.pdf
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/sepizi.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131027d7871a---dewavinofafobiwofewe.pdf
    • https://publicbridge.pl/userfiles/file/19447932006.pdf
    • http://bresky.cz/res/file/zunuzafabalabakaxulonu.pdf
    • http://kssi.ir/public/userfiles/file/romivegitudotomezeraw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+new+gun+in+warzone
    • 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_off0000d697.bin
4c40465197c216974040f7b1d350ca42b7c14370d396a6b03b774fab5471f240
pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 17872 bytes
font_01_sfnt_off0001053c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
font_02_sfnt_off00011d53.bin
37bbc19769604cb08e40c69ec4e640abda067d4bfa1e4abaa31d831c3323a6b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10284 bytes