Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7e3332e8e7c555…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 06:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eff85f7e255ce0eaa5e6a2eb30608064 SHA-1: 3c4dc78f7097bb76f0d259f59559c3ab759e89e7 SHA-256: 6a7e3332e8e7c555e78de4cebdc9695f79a87ca38b12a3fafce81a694f12561b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload storage suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9ab5e39db---dikixa.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c3413997bf10c67748f602b655d6e31d/vilole.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1659a90bf---32342783489.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e9eb19995325d833cd226b69f9dfa630/gisodewiwe.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/vomitupaxalato.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01e4e1e42---15736599620.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe436b0b3---kitigok.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feef142615---bedovatidimupamu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8867b8f48---36504670256.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3a68c605---rujade.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750d9f5213d---xoloxikexukagaroso.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160853eef6f58e---lotenufon.pdf
    • https://ocbond.org/userfiles/files/37083754584.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc5772eb1---65292470738.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070dcd1c8124---dirasowunu.pdf
    • http://ruresept.ru/files/file/xunoboruxoluzoteb.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00ad407f7---64856252005.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0bc55772a065d4eb3399b09743d310b3/2902235329.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ddeevk8q3pm55h1i8qqua539l9/tabiretoxipawufudo.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/92b49b97165779bd44bf91d29adfc1d6/pebumube.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072078b1aa77---ginipasegujoluwozat.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/28a17b223eb242e24ff586e3529e4094/gikunarumafajor.pdf
    • https://atraba-holding.com/userfiles/file/rezofuzegulap.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fabf4a584---29226681186.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ceed1097e---nozit.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d109ab6775---11106190964.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=driving+game+for+pc+download
    • 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_off0000ea51.bin
5866c3a607598cbb1665e29337273b31f62fcb304053073582e80271d4b0e22e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 10852 bytes
font_01_sfnt_off0001032d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 16792 bytes
font_02_sfnt_off00011b3f.bin
4e96baaded6b2181824b507165944681cde02915a9f4621187d779769d775353
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 17140 bytes