Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b59c8adf628f4f8…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 15:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5bf59cb01fabb276ca9e2d54ff86b88 SHA-1: e82cbe4026ec2695b5f9ff818835cf3aa49fec2c SHA-256: 4b59c8adf628f4f8187c0b184e21887b5bb7fbdfdb60afef449738f9232a0d0f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/tasunugabupolaxir.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/get2df3cscspsp9q0b62o9rld4/xivemod.pdf
    • https://palcev.ru/userfiles/file/99524834568.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/59d7c714ef3ec8098758974cb9dd2c66/3096859041.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ie42qrvmbrl3djrpe2ggika5qg/xexilovaxub.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4802dbcbfdeee69b8415efd8071e46fe/52572931030.pdf
    • https://tectrongim.com/uploads/files/88963145182.pdf
    • https://fruitssupplier.com/app/webroot/img/files/10542720474.pdf
    • http://alexlunacoach.com/img/editor/file/zovawaxefukukitixuxexu.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a9baa585abf---gavawubazugi.pdf
    • http://micronforgacsolo.hu/UserFiles/file/loparifajoramugupegikukig.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7fgan5gm65lt0j2sl67aih0k7b/75397385976.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8a29c17b137093149b4944f7ad112889/95218668850.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bced5ee1d7b4ddcbd1b6e034e7c0462e/rejulatiguxajela.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0s81qvrmmu8gsv44ttjot9qk35/61641552998.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a305574da0---31607617288.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/54038c8ed9d04925f7db7ff1d83a237f/54294171015.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6879cea296280025aa630e07fd07a700/waguwubut.pdf
    • https://benqmusicworkshop.com/fupload/file/vewakojafetimoxuzar.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f564969---42921137848.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1cbb6220f---zimewuwuvebipixug.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8611f1e7d86b0b9e3ca581c0a526b836/molopigezotuviw.pdf
    • https://baxsporthorses.com/userfiles/file/42215673460.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/gfunorvh4jtucb0ejc5ickg02f/sexubexizinu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pinched+nerve+near+hip
    • 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_off0000f338.bin
d16a3121c0ec34de9f86c53b4a8365710d999676936b3085ad502265d995f0f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16420 bytes
font_01_sfnt_off00011e05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 16792 bytes
font_02_sfnt_off0001361c.bin
77374a63ae9f553b562b79e6ca6673a1b9dce983aed98efe046b4aae8bb21731
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 10244 bytes