Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e6967bdd9bb7ad…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 15:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00040e40480a9192cb241c30ea1696d8 SHA-1: a9e6f38cc2f83d47cbb40218e9b865a5dc28dbc4 SHA-256: a7e6967bdd9bb7ad0653d4601e81f8bda6d0b04a366f2d20e66b4661fd685633
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a pattern of hosting malicious PDFs on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://aviseco.ro/userfiles/file/23134876348.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/brtr949rqduq5vr9qjrol1833i/dofirojedoraza.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de9b7d9ec---65888516.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/cdrvf66fngecrs3i1i0gsj3ut0/nizipiwitugitorixetawumax.pdf
    • http://compsult.net/userfiles/file/pabudukatafudovenora.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4e0098e4c---vagiwipapu.pdf
    • https://susta.vn/userfiles/file/88892976785.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e9e68cb06d2abcbfb86add839f6de935/57408021674.pdf
    • http://shengnabei.com/uploadfile/file///2021061408003786.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/35283ef6992724942341caafe45354e6/wisuponuwilerizodulujuda.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ote3uifnj8g0c4tg0liasn04ng/6159622963.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/46e935489357d72b8f70e5f7dbbd05df/62075763798.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b9893ffd99fa72eca832bfb2b8a73dc8/99865461329.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/36395644209.pdf
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/93237152524.pdf
    • http://teplolux72.ru/upload/file/majizisojedukawetifaxe.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/butoge.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e154c17af4191aaefdb740aa431f144b/41947805104.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160982f72e0526---29813881117.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e6c0d5b6---vajarovusonixat.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/167071b3310fa1fe1dbee045041e5f75/saveduku.pdf
    • http://botosani.ro/img/uploads/file/44159908804.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=nms+sell+extra+multi+tool
    • 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_off0000ed11.bin
c7e14c3e35bb0487b5aec2dab149e7c2e1d15ac5342824fd0a6677e7e57ab6d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 10344 bytes
font_01_sfnt_off00010471.bin
2d55f3a5083ae4d5ee7ca49a2c33ddc3a46fd94dc0b8c162cbca2ba4f290465a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 16836 bytes
font_02_sfnt_off0001305a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 16792 bytes