Malicious PDF — malware analysis report

Static analysis result for SHA-256 829a06173b1aa8e9…

MALICIOUS

PDF

81.1 KB Created: 2021-08-23 12:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79741789b22884713466cc8d90bc9d48 SHA-1: d574bda71d085361f42e6574cdf501905fcfc582 SHA-256: 829a06173b1aa8e92f6adb62213e6c6370489195e6ed8c15df425196e76f9134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=importance+of+study+design+in+research
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89b0c0a19b---feditonisor.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6d7da7bb89fa3f4108c1fea1cb92c5ec/liguxulopa.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afc99da3f83---pumulu.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160975d2adbc25---didozupofazusobeginokerak.pdf
    • http://vitalchurchesinstitute.com/files/file/kobuxowufekalubemuki.pdf
    • http://alkanboya.com/files/file///vimemonejapupixuj.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086472e4bc30---bagewidemu.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/duluxisomefabobaleden.pdf
    • http://enotecagaribaldi.it/userfiles/files/wajuwusapakot.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e369834---86633493965.pdf
    • https://africanresearchcenter.com/userfiles/file/35202320888.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2j29qnsq8aq958rf60d9o3bf84/ropizopadapezozezomefaf.pdf
    • http://fertilityupdates.com/userfiles/files/dasugopogeliverib.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073db5fc4f3f---21258733950.pdf
    • https://addsfly.com/userfiles/file/lisaraliven.pdf
    • http://buergerforum-tirol.at/file/38792909212.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/damasijiwipaz.pdf
    • http://studiogallerani.it/userfiles/files/11814587566.pdf
    • http://zae.me/datafiles/file/66923273771.pdf
    • http://ipsgroupjjn.org/userfiles/file/pedixof.pdf
    • http://kxnjl.com/userfiles/files/47095304882.pdf
    • https://harkakotony.hu/UserFiles/file/belafimajapuzepeduvup.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/86f6d533fcdbf6eb2aafe4f082072aa8/murosuzidavikus.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_off0000d956.bin
43f2da7a1b0d742ec8f927cfaec9a3e1ca8afb9373c745467d94a334f1d3056c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 11188 bytes
font_01_sfnt_off0000f320.bin
5861fc9b51a41d2cf51f851d9a8c795bec062470730b3ca30b467152a6d57464
pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 16628 bytes
font_02_sfnt_off00011e61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes