Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca2218d4959d0f2…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 14:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a64d2f35754930efcca49dbd8f876be SHA-1: 5545f4256a8108ac726cdd66806dc5df3fac1e65 SHA-256: 8ca2218d4959d0f2caebdac98e95cf309cba27350e8f508d0dc745b2ec0d7b39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. The document body was unreadable, but the presence of multiple links to compromised CMS uploads strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pm88u3rq7ivunekattle2b2d62/nupudu.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/xumagag.pdf
    • https://rocksoliddesigns.biz/userfiles/file/94327106764.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe579dc08---84995089720.pdf
    • http://jp-cable.com/d/files/jegumezosomoxawew.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/c8c28dkf6vq2st1qcs1lr0h1ma/totuvipexomoxesodikipene.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b83056bc9c960f6a6a51640e4824990c/46736942055.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d5e0ce5b---jakopuwow.pdf
    • https://tezerwatch.com/file/upload/files/06-18-21-53-07-89.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/jqob91ie1flnvrqlfplbdpscg3/54350070714.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160866667be5df---48217162759.pdf
    • http://alpha-th.com/userfiles/file/32348175420.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607995e76bb11---66980416097.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160882cb72184d---33009794093.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a097dcd4ce0---93478691158.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608572869cbfc---39352050288.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=most+ionising+type+of+radiation
    • 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_off0000e490.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 16792 bytes
font_01_sfnt_off0000fca2.bin
17f9f83b93e687a1dd6f70981697008d89801dec70f2ec75de8693f42a8f7dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16864 bytes
font_02_sfnt_off000128b0.bin
0242fc7caa925726951b181e4f1036a7437c01cabb5c0049b9b5682bdca0e35a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 10736 bytes