Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef9bf73c0ad1a65…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 16:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86706b2ca9bbb3e01f7b4a03aa727bba SHA-1: 408d9dc226cb36f5ed45fab47089aaf41d8ecd4c SHA-256: cef9bf73c0ad1a653dca9a7d957a252367fb894a51e0351c34cc5de376caa607
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/89323560822.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/1d92a14907fb649705a823a74bc52b60/sejexabakinuse.pdf
    • http://belloverde.net/emailer/file/66710552540.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e0c48e58---pabibuja.pdf
    • https://pointvirgule.ca/upload/editor/file/87614552861.pdf
    • https://yaslibakicisi.net/userfiles/file/43961145874.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160882354c51f7---38858676083.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/76359289637.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2b883678da7d6f0405a092bd5303fcee/dezafowoxodakolux.pdf
    • http://canxetaidientu.com/images/file/pofufuzepo.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/11232433150.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7e413104---96091625455.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea30b43f85---37082699645.pdf
    • https://kompaspt1.com/contents//files/63258592685.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f212bdd66c---nesurijulukak.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d48e2d0ca8487ba861cd526051e18a5/68095450934.pdf
    • http://vanguardhungary.hu/userfiles/file/nivupewaruliganapef.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e021b8fd39---96112346202.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5188d11d4---zepuzur.pdf
    • http://zuestag.ch/userfiles/files/morakipo.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a74ae60beee---wodanokidorik.pdf
    • https://planet-for-events.de/userfiles/file/73804293497.pdf
    • http://drtamerturan.com/file/30986926523.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3d9d218f3e43e09869d47a4e06642527/70290891927.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=2019+calendar+with+holidays+philippines+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_off0000e0b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 16792 bytes
font_01_sfnt_off0000f8cf.bin
e2d7d495de3a7bf0f3e623db333c92bc8cde252f59ef5a87fcfe6acdff12fbfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 11284 bytes
font_02_sfnt_off0001136c.bin
0bec6a47b8703006a98ae9aaf6f23cb8def8caaede6374ec78b3d3a9ac4fdb40
pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 17992 bytes