Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd8cfe37203da70…

MALICIOUS

PDF

84.2 KB Created: 2021-07-24 22:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6fdd6d32b91170902f3b1dbc15eead0 SHA-1: 1e921968f596c362a792b5f0acb3066e4d649838 SHA-256: 0dd8cfe37203da709fb31dd1776fda44ac298c468e129269fc3a1335ae573f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute traffic or potentially host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 http://qunjl.com/userfiles/files/gikupidozudefegomemes.pdf
    • https://fokusmedia.com/images/uploads/gukawimuvatorov.pdf
    • http://shuswapladystriders.ca/userfiles/file/nepejedinelale.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ukpjnojtf5i5g1igrp63shlvo3/1606679251.pdf
    • http://lifecare4all.com/upload/files/vibekotatumesuriwakefox.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ff56ef33b09f30372a0e8d4be41132a6/37516212130.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vodulikiruvoxakonex.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8e89e6a5608082a235633971a6881727/zefadujikubovex.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94469650575.pdf
    • http://clarksville.net/wysiwygfiles/file/41285655000.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/767e6643e55b3768c6db99ca315bd849/76422647423.pdf
    • http://technoculture.cz/admin/upload/file/85245273977.pdf
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/dizoj.pdf
    • http://netflor.pl/upload/File/janebofunakabozo.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16228185731813.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/59465bfad6bb72b59ae6a3d4861aa301/raropedo.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kuwupejomize.pdf
    • https://flardochform.se/userfiles/file/57916488957.pdf
    • https://newtop-eg.com/userfiles/file/18728951330.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608530eca11b6---malazuvumexun.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/62ab5af3388e971f48ff201a467f6462/78469353674.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lk8bv5go4h4rm38tmg198fb5d2/83908148054.pdf
    • http://toanthinh.vn/webroot/img/files/44787323687.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=small+engine+repair+manual+free+download
    • 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_off0000e7ca.bin
0715ce923a8e3edd4abdc7b724ff7b92c99c067409d620f86a151f8e5f71a2cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 10836 bytes
font_01_sfnt_off0001008b.bin
dc3aad876acce977f1eaf493e2f033edd49be0a3df095690df89e5600621ab3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 16332 bytes
font_02_sfnt_off00012ae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 16792 bytes