Malicious PDF — malware analysis report

Static analysis result for SHA-256 643b9ef6a4da4de6…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 05:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1edfa66f122a008aa16a2fd3d0bf5b32 SHA-1: b7e9a1f8ee8d35f3d6670dd1cba3aa3263519e53 SHA-256: 643b9ef6a4da4de6bb9333dd532dc21eb90d11ec796accae447e1efc93f8bb5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/126a049ed5bf87e4295a71f593e8f829/xudanasov.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160738a00748dd---samafen.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793058623a5---labapozesukojen.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74e0053cf---4873601709.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/mavazovo.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/beminubufage.pdf
    • http://hotelsandmartin.cz/files/file/divepikes.pdf
    • https://ludifrance.fr/userfiles/file/sesupividosusigaloge.pdf
    • http://sumterhigh89.com/clients/863574/File/balaxutur.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ec5ad9787---neselatugomikex.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/3ivis547a9r6buq1do0ejb91vc/84414016276.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/eb66c83151b9d9f489c3c94a407f8611/33994869308.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf53b5488f---81443128875.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ca8d10120---79825303948.pdf
    • http://granitemountainranch.net/userimages/97261601333.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cri236eu4tqoui13jumc97be72/tevebalafumuwebot.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607682258d2bd---88059559115.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d501f45b944---nolukofijofoganepizuwu.pdf
    • http://www.aadhar-interior.com/userfiles/file/lewavel.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b167ba0f677---fujorokudolu.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/tegenaxalutaforipedazi.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/sebv50eic5fdsf2tdrqa9hb1m3/tanalusebujof.pdf
    • https://diarch.in/WYSIWYGImage/file/vogoxejoledugeliminos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=old+time+crooners
    • 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_off0000eeea.bin
3d47fe8a00862207047e8f4d13af3e4d5e1f70e995371e79e145f82fae664110
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 18032 bytes
font_01_sfnt_off00011e20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 16792 bytes
font_02_sfnt_off00013637.bin
5667ecdb970c58b81ce24389f2956ca828aa85581f7c6a50c67b446b370bf515
pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 10396 bytes