Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ebc739af160c5d…

MALICIOUS

PDF

78.1 KB Created: 2021-06-12 08:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b249354d9be7b936b8c539b5b0316f6 SHA-1: a77f9f0a2843ba4cc29a68bf5e007d5d8125e8a2 SHA-256: e7ebc739af160c5d44cd3bc02630a7b7b2d9657c47d1af3a26086e6221bc48f1
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, contains text related to movie downloads, likely serving as a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=tamilrockers+malayalam+2019+movies+download
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3698acb67c---68753054448.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c388b04cf20---ranotavugituxabet.pdf
    • http://accu-chek-event.com/ckupload/files/69239432202.pdf
    • https://activepymes.com/pub/file/27583485353.pdf
    • https://acgroupenterprise.com/userfiles/file/pogerefopevasofike.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0223128a4d---lajusakod.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51beb74b0c---9271274106.pdf
    • http://xahscw.com/userfiles/file/95724727127.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/potuvimegodod.pdf
    • https://apsco.ly/userfiles/files/42395780214.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d80c7eb8f8da5be8f747a1b2a7d9be0/50935565080.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607249a8481dc---bojanumej.pdf
    • http://goteneplast.se/files/images/file/xibadixur.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16098655e1f657---71065565214.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0668df8ae---84228343488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f295.bin
78719b1ba4e8c48012b32cb182601ab1f2a10654aa177656bd11363c2b96187b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5832 bytes
font_01_sfnt_off0001067b.bin
cafdcd527920ec655a5591d3bf0371a94ddd1e5d6cde6ff4a66a76b2af970272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 10696 bytes

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