Malicious PDF — malware analysis report

Static analysis result for SHA-256 6390947fcd61fbda…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 00:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2160d68cf8680f5a295f5d657b8581ec SHA-1: 6f82906af8b63e30f53384399663a4cf17658048 SHA-256: 6390947fcd61fbdaa79b27fec5c75c8a1b42fab44825300a78fabac109bae56d
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f84ci8gpm96onfcimc0ji3cmas/69956324020.pdf
    • http://bright-inter.com/file_media/file_image/file/9191776754.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160776e5bea636---zikabaxalu.pdf
    • http://flirdining.com/uploads/files/19000978135.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6274c4b402---79097059576.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/92617f7bae1249f5c0e20a0225587a41/vumenojofelonedamavasusos.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019af1eb81---73467096372.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/72e90889ceff025d55d6af844120b8d9/47353242780.pdf
    • http://originalcheck.it/public/img_admin/file///digazijavuzinokasukusa.pdf
    • https://an-professional.ru/img/files/file/92901028533.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a40287d2---47928852547.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863bd2d8094---74786282618.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4vqv5a187ufcjgkmr7k0nhagno/ruvuxabidonoboboninafa.pdf
    • https://sbufficio.it/file/ratetutosojaxos.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d5796599---sosixojireziwuli.pdf
    • http://dhf-china.com/d/files/20623152679.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faae42dbad---44034206502.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4bb9bb2c573cffd18ce6ac6402414735/mewefogoledij.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/83003293897.pdf
    • http://alexandercdg.com/clients/36029/File/xusesalifekarawafarobup.pdf
    • http://absolutelyneon.com/userfiles/file/lagokadalulozejat.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4f1b4b1d---97811418688.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607013e23b1b1---91466109853.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081813e29957---funavuji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+life+cycle+of+silkworm
    • 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_off0000ea3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 16792 bytes
font_01_sfnt_off00010253.bin
f97e835cf08e2ebfd856e5fa4fa9f81480dee8965738257a5a5edbdcfb724a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 10784 bytes
font_02_sfnt_off00011b46.bin
f2fdb1d7ae45d15742f0cb149a09c2df25f8781e3333856bb3aad73773024b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 16436 bytes