Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4112f94b5406f3…

MALICIOUS

PDF

75.5 KB Created: 2021-06-24 08:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a87056038edba1385425b39e5c4664e6 SHA-1: 61079237cd38bf2e4bb012a09af43b09eae6aed0 SHA-256: 7a4112f94b5406f395e9f95cd37411af1cd63e08be65551fa339c0775221d9bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, suggesting it's designed to distribute further malware or phishing content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c3be406a18ea015f617ff04ddb7983fd/20059654300.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7fbf9ad2501aa3eff6cb8bf034bb34ec/wusaj.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083458c11374---7533664345.pdf
    • http://ilkyoukais.com/Images/Media/files/vezadozujutumawosu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915e5f43b9d---50748520993.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838323be9e3---zukokaburewog.pdf
    • https://unosms.us/userfiles/file/jelop.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/h9r6ui0ilgq0kf85qbepd6cah2/zonixulilife.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/819eb6f2e9f26122d6d58372be89e3cc/toporudabomulake.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4f7497a85c2923d13fb393b0f976e056/bugaboxowukogakuxowep.pdf
    • http://splogservice.ru/content/file/zilusizibumetilujon.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2919478b5d---xuxomukugevofiregugejabuw.pdf
    • http://dh-life.com/ckfinder/userfiles/files/degiwedekerudewakanupap.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b8102f2971489681ce14ec21789c793b/dudexogumeniwin.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/fb389091ad3855ebcf5c01142d70e9cf/89823388717.pdf
    • http://sanruou.com/app/webroot/uploads/files/72081795651.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a20d8d23f---woralafanibofigakenuner.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=neufert+pdf+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d4.bin
e9221253347ceaa43663fe5090415ce488cf034f86d75b990298adb3444d0ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 4916 bytes
font_01_sfnt_off0000f6b9.bin
53c936b82bf65f0125521bb90eb7dd6d6f3dbd5f31cfd72435e581b42c292f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 12500 bytes

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