Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9951b7e526949e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 21:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c114ed2db13a9b24f5f9f916ed174967 SHA-1: dc27e27a3df6907d20e6aa06a85dbdba8246b4f6 SHA-256: fd9951b7e526949e0ad875d880bfa0ba6a0db4e9955701ded857d9104538c8be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external URIs pointing to compromised CMS uploads, disposable hosting, and raw IP addresses, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=houghton+mifflin+reading+practice+book+grade+3+pdf PDF link annotation
    • http://kengosushionlineorder.com/uploads/files/81380426241.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a580387b2a8---633966743.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74de16146f---mimewurijujamofosuwegomes.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/90560299306.pdfIn PDF document text
    • http://woykoff.hu/upload/file/vivezofelo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522062516409320.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/9598726281.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/81ofp109b9kp8i5j31mh5j9d7j/74026869633.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e333425---53378927146.pdfIn PDF document text
    • http://77.158.216.156/ckfinder/userfiles//files/papuborikevekuwufategema.pdfPDF link annotation
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/br2qjb6tavqsucourun1vt411l/pojujejuxexagurij.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c5310cf8---1880039504.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pcgf9d8953dhou2uggaob8mlah/99172352473.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/nituvetibufimelalim.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3447ae13---gakisepu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a9514bf3c20d2a0e74f9ad6fd3b63dfd/fafowobadada.pdfIn PDF document text
    • https://lecachet.fr/docs/files/vozogovawaburudaxojakadev.pdfIn PDF document text
    • https://wagaskar.com/media/12085222070.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665ec65fb9---digidarepuli.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160897985b785a---50567516304.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/75cab5820d005a4831d1758739c7dfc9/notevapexudefawibubaxo.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/37666745407.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55c6e6c2f---guwalekuw.pdfIn PDF document text
    • https://polandpools.com/contents//files/gatimo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 11396 bytes
SHA-256: 3266422fb2148e891937e5a2c949007b2982613e083bd059cc2fb0242e8c9af4
font_02_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 18192 bytes
SHA-256: 955e5f40a543f51c624cf618d4d327d01425d577eac35f1241f1a864dd0bcde0

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