Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2b3ff6099c871a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 01:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 106b5015a9bd4824a5beeb6de856ea9f SHA-1: 726a0bc9e9399005e5a68c0e7d42f19077d6e87c SHA-256: 7a2b3ff6099c871a0c09c04360028c34a379b41c60f92177b5707c0b140c3115
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to external URLs. These URLs are likely used to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=gta+san+andreas+cheats+no+stars
    • http://taketty.xyz/js/ckfinder/userfiles/files/nimamajiparigo.pdf
    • http://portableandcool.com/files/files/xobigolutoxivufabuza.pdf
    • https://willes-gb.com/uploads/files/202109101552556027.pdf
    • https://pacie.vn/web/uploads/files/wajuwofolekomusoxavo.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f368fe6552ef0a837eca960a61656354/mivikuravawefoketu.pdf
    • https://deniz-sogutma.org/img/userfiles/file/satolepewudesavazesipopez.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/gikitazuje.pdf
    • http://2ds-creations.fr/userfiles/file/94450762068.pdf
    • http://elitaliaweb.it/upload/file/rofojilogapatizu.pdf
    • http://allnatureint.com/userfiles/file/8622814674.pdf
    • http://reckdance.pl/userfiles/file/rodebifotujinojol.pdf
    • http://salkim.com/userfiles/file/75789354647.pdf
    • https://vinocastillo.hu/editor_up/purodamakusagu.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc13331354---gawapaterivowo.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a94a21ce4df93180f279b24555974d0d/53877567362.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/646c3517821c2d2b89ac906ded261485/fowagewudupufi.pdf
    • http://artetendasud.it/userfiles/files/somexazanaba.pdf
    • https://bushregenerators.net/userfiles/files/75039054395.pdf
    • https://haisanquangninh.org/data/dulieu/files/diraxureba.pdf
    • http://xindeshiye.com/uploadfile/file///2021091400025124.pdf
    • http://mastervin.ru/files/file/rasejigoda.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/52812896176.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613add091be7b---supidekajufexuxaxeler.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_off0000da18.bin
1d51516d097bf699561dbefc0acd28a0735231dc223f495c4150e80d882ca13c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 10368 bytes
font_01_sfnt_off0000f181.bin
0276af04b3f53eee0d0f10c807e301940666eb875bfa89099f0999ed8707be18
pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 18000 bytes
font_02_sfnt_off00012034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 16792 bytes