Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe78a92818c8804…

MALICIOUS

PDF

99.7 KB Created: 2021-06-28 08:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fac79bf7016c357e26a6428f594ccd99 SHA-1: 531476e81ad31707d0bcbea721da269736732d3c SHA-256: 1fe78a92818c88045d6d27ea29e3c9aab970d7787a194b73957f1321acd2ec09
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself appears to be a lure, with the primary function being to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ae777bc4f05f19df1b97e34f522a21eb/26241544035.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6gant5ctio0j6mkjsg9mgpbic2/pelevilidob.pdf
    • http://novichiha.ru/pic/file/81547215746.pdf
    • http://eperon-kochersberg.com/img_db/sixepamijawaj.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3981cb2c14---kirudojazekegosulogo.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b21646d47---bixufumebesitigiguriruneg.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/lozotumumiduvepexu.pdf
    • http://studiodrago.eu/userfiles/files/pazamawinuboferitifa.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/opei4a1cqtmdeqi135v9v770sk/40146767776.pdf
    • http://alacarte-design.de/userfiles/file/55001674660.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2033bbcd9b---tijozawaliwusukupawapome.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d4453957---zepanusirurosezaw.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5719c2cc---61873376875.pdf
    • http://creptiles.dk/userfiles/file/40539588956.pdf
    • http://cuatro-pr.org/sites/default/files/file/bosajo.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd12f2eddb---fewuresororilipi.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/xokukukidobifozitedofa.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/04ce01357b405d6a0406b5ee3480f6cc/kutelijijofenemesef.pdf
    • https://avgdesign.com/userfiles/file/koxukutu.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/599f023198e9757287594ec1b050ea9b/32302869994.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caac83f993---84887212199.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/22b567447ca3ea6ed51c6c4dc2929538/lutevefipisaparu.pdf
    • https://arte-salon.ru/upload_picture/14342918377.pdf
    • http://gabortech.comadmin/file/7958549191.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/33125915aedd95d5477f28433c298b22/87809052937.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/11e4eddf91f546ad62e7e8d988766c67/rojekibotaluxemafosulu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wizards+1st+rule
    • 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_off000123e7.bin
e67ef8a10bed63ea9acff481f6e4c238122f715e4484c8d36a0d07ef93d9411c
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 17208 bytes
font_01_sfnt_off00015137.bin
9f39c446ad38639a95607b9d6a9b0c13d3de056fd7a994818345b2a6de89bf8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15137 10224 bytes
font_02_sfnt_off0001685e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1685E 16792 bytes