Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3658e652ffe5c2…

MALICIOUS

PDF

82.6 KB Created: 2021-07-08 12:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25464d07900ec8660d445fbcf193f8a0 SHA-1: 43b143d4d0fa535b7a55255042c4c5d63b5d0378 SHA-256: 9a3658e652ffe5c2eaa244c76df367e4c10d097c51b0fed59ca61b3129e81437
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristics and URLs clearly show a pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79fb71ac9---rukeminu.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f0936e54a03c3638cf71755509b72f10/suwana.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8b6b8aa8b06af96f546bbb59961facc7/xegikotizolavokerixixusel.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/segvvlbb6dvde275ukeh7pq4n0/64505323075.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089bbd84166e---53221599691.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e7890cf0cfb29a499181412027814753/50360035366.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcfa72f5e---27223510963.pdf
    • http://firanywiktoria.pl/uploads/editor/file/jomajumagemusepumurudifi.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be6896d4eb6---86234555284.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6983701aa1e01fa7c59d0b8089b628db/97815369289.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3aedf2a539050f50f7ee1daeec8d5c26/verokopafetixibuz.pdf
    • http://nuestratierrapremios.com/campannas/file/gukunabajeba.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q641o545e89bjdlkqjkmu4osl7/rurivaxofajuze.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c010f32baf---70917981466.pdf
    • https://atcotourismtravel.com/userfiles/file/jegadojedukavixub.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c552272bbc---tinotagezakutebagitivaf.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62e095a6c---pojekurelita.pdf
    • https://apskarota.org/userfiles/file/jolor.pdf
    • http://ingenermarket.ru/userfiles/97372142624.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/31a4dbca7402f608e3375edb16ce3699/6658989233.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8feqaskjsimrolrhri2ap19smm/japurilita.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f7010a43ae351a09d93065b1665dd721/79418601678.pdf
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/19409048552.pdf
    • https://calendarsunrooms.com/userfiles/files/tapipa.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609991ad3e6d0---fatafesola.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607466daa672c---xojisipulot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=it+was+safe
    • 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_off0000e1c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16792 bytes
font_01_sfnt_off0000f9d8.bin
5cb4d7ae393aa2d9bbf5432dde64cbe7b57f0fafaef0f4574d474cdab88bd7e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 17016 bytes
font_02_sfnt_off00012624.bin
0be4c38c48ddaa0283ce498b909156a1041f95f1eacc78c4f6e22910b4af9346
pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 9780 bytes