Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3068936735249c2…

MALICIOUS

PDF

85.7 KB Created: 2021-08-23 09:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d02ed6e1ed472b23f38ce4da04dffb0 SHA-1: 1fb4a6eb27df3162c569a8b74a41e2ab7c70f148 SHA-256: a3068936735249c2c8229a451d06e61c0722591a8dd4e2a1bd8f3cba1e3cf29c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded JavaScript stream and a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious content or downloads. The primary lure appears to be a fake download for 'monopoly full version free download for pc'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=monopoly+full+version+free+download+for+pc PDF link annotation
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/28498965897.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/70574571888.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/wironak.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/da77c2260f012baa951af9a9caadddff/sixelavebojekene.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094cde0bc9e3---57630785242.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/4a0984599ec9c6fa0a76f646c0d9dd45/20377609313.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/4573817086.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nikojudovojifekopodite.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/62097442355.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2113ab80---57895990919.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087387d7149d---wonulab.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5d635ed4---21930570066.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18764ff5f---32006528792.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/luviwirenemafavi.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/3218908738.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/23134286323.pdfIn PDF document text
    • https://tsegypt.com/file/63423850024.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/74aa2fb5ba83aa8f57d3ba7ea8b100d0/nonug.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608046c5a0c6a---77181252215.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/robiwefidibekitibavokojo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a6afc83f8969b4384b4998f47cc348d5/477689719.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pr1qpg404aefl5q7gnomhidug6/35456008534.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/sugujovojilupu.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/sigen.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e57d5295508---2451906503.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fcdca1a38---givarixusefux.pdfIn 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://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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 17640 bytes
SHA-256: fc44e0203e67ca72187ef84c09c6ebc18ad410de03de8b89b017164634bf65f3
font_01_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 10872 bytes
SHA-256: 88a62563bff357199456d2cd7a350a67f3ba061e08dba52d6920bf61ceb40b44
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1