Malicious PDF — malware analysis report

Static analysis result for SHA-256 87871e4e02cebbd1…

MALICIOUS

PDF

109.3 KB Created: 2021-06-25 22:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d98613bf9e3c715045810aab71c2067 SHA-1: 83aed47f159bc713be6dd55c924465c5ffbb3a50 SHA-256: 87871e4e02cebbd189f08cfe1efda466da99fff078a5fab3adcc16f7227148d7
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 by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links are likely used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3218da9749---jiximizilegasuxumugimefe.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca852f01fd---guwobowewuk.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/s34apd80s1fjul4baqvhu9d97b/87309267306.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/84371055976.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae76444eb---39631736896.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/rupetigidujavif.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/etkvkvr3hf39gbh8mq8ib9s88i/39389017905.pdf
    • https://by-express.com/upfiles/editor/files/kogaror.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/198d3d797005c160146cd87a316a00bb/23317172453.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bb5d97622---67639309173.pdf
    • http://botosani.ro/img/uploads/file/zuvuzovaboxovixus.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160939ec0ea5dd---bivij.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b692739f7c---66842198736.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb38cde092---tefufizisiwor.pdf
    • http://aimecostruzioni.it/userfiles/files/limawutegolijedekimojuzif.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6491c46c32db6ec311f24c552f62dc3b/gofomipoga.pdf
    • https://communeouchamps.fr/userfiles/file/95405529650.pdf
    • https://autotrans911.com/thread/admin/uploads/file/70430666896.pdf
    • https://carlojans.com/cms/file/84368433297.pdf
    • http://maility.pl/_ADRESuserfiles/file/24636696699.pdf
    • http://micronforgacsolo.hu/UserFiles/file/68850016911.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bbc34cccf2cd396d597123e40544aaf2/94584366544.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/598626d58d19c63e72a72b0a41a0dea7/80980637806.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5482ff5b0ef88f4a2b5832208aede064/91874666071.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=multisystemic+langerhans+cell+histiocytosis
    • 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_off00014697.bin
6b3ee36bda587fac634bb23071c603e99cebdf164e1d5150fe403fc0c135b51c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14697 10884 bytes
font_01_sfnt_off00015fa7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA7 16792 bytes
font_02_sfnt_off000177b9.bin
77c2cd7a455c5dff28069b5e439b1e6da8d8e5e1d4ad1d31d8e3d0a9406eec49
pdf-font-stream PDF embedded font (sfnt) at offset 0x177B9 18560 bytes