Malicious PDF — malware analysis report

Static analysis result for SHA-256 927d6906cf532449…

MALICIOUS

PDF

92.3 KB Created: 2021-07-04 20:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c51244281102a30f545ad7d9b9d259f SHA-1: 573fd7f4b8ce18d5711194e9bd67c97bf25a2bc6 SHA-256: 927d6906cf5324497a4aa0bb3dd6709b1f88eb13a9d445a5c2269381be55c6e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The primary function appears to be redirecting users to potentially harmful content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8ce2f3f9---75877424896.pdf
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96148606076.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kv9k0k9dnjugghl0m5m21uutbo/rikabojutijejinawajufu.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4cdc642e29918d3bb647a9823e220b1b/25712757473.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d32a973cf5---nufusavel.pdf
    • https://ludifrance.fr/userfiles/file/62390149970.pdf
    • http://gyobel.itpublic/file/63670732251.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4899769ed3---gumep.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfaa48a95---dizudakasu.pdf
    • https://media-get.com/userfiles/files/56128190018.pdf
    • http://cfacgroupe.com/uploads/FCK_files/file/vivirerupubugivoporamage.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160842647bf7bb---fonaxefi.pdf
    • https://machinex-machines.com/UserFiles/File/80435440376.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e3d0191d7d2a3e5786a2cb5836600f39/85792903998.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6f35ebb2dc36b6506c705fa6c41caeed/27396684779.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/abacae5dc0c678e8ca0bb11cecd7b14e/polokugoxapofe.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6d4c78ef27af2cbd2e7c21561fc0dc48/3949448777.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6dbf9d762a56d20d567e7e986beaeaa2/lipelobofolimavurig.pdf
    • http://transcash.com/ci/userfiles/files/40033586670.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9edf22a46---tuvepifo.pdf
    • http://begemot-rus.com/uploadfiles/file/2021052814155473499.pdf
    • http://alimentosldm.com/userfiles/file/76486097146.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd1ca55c6c---61767117581.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=secret+life+of+bees+racism+quotes+with+page+numbers
    • 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_off00010446.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16792 bytes
font_01_sfnt_off00011c5d.bin
8dc8b65db2d0e31577d36230da66e8362c09d490c6cf3ce4d7ea4c616e066790
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 11476 bytes
font_02_sfnt_off000136cf.bin
375cd56ebbebf41d72cc16705c10c1707dfdd20ea73d66d862176c74608aafd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 17164 bytes