Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc74659faec88f57…

MALICIOUS

PDF

105.5 KB Created: 2021-06-29 00:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1ca501546eaf810a6132594b4f68ae4 SHA-1: 0de4d240a6466af8b0e46db6431d5b7878349803 SHA-256: bc74659faec88f57355bde49af3099ac7597b261269581d195fa190abbf16fdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64c6793bea82315938efd17f7e2f682f/kirusobatututodamotokol.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cb1ddfd67ee9237da88e737d0b088517/dibosidoniba.pdf
    • http://donghozibistore.com/luutru/files/26116711840.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8bc02080---bimirowidulufa.pdf
    • http://donateagift.eu/userfiles/file/xurakujamazopisine.pdf
    • http://dspec-car.com/js/upload/files/86807212570.pdf
    • http://ersatzmonitor.de/userfiles/file/vedaw.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/dc3c00d010780bfe723d6f683d038013/33095216311.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2blslretpu7m8fhki0fo9pkble/gexamijaka.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r1ag2ifj1ivfjje5kc56b1n0v6/mabewubadomadasopofug.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/vefetujiv.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7f05d9334ef50e8c2a52287fcb085cf5/gosagitisefatatusaw.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c78bbeeb16---90392992771.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737472a8819---29429959832.pdf
    • http://files.ibiza-ferien.de/file/43022266344.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mkiatpc298h713n726p22ode5h/mimofamapagirunodubo.pdf
    • http://dolphinkorea.com/files/files/netabapeviriniwovopefub.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/43941132d70f9ef3c5cbf5271247bd35/saropixas.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/kiwad.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0e4ce84b914bcb9cbf2bc050c0e1c22d/segotapofoxezorixabup.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073efc98f2c7---nerexogu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/et3mmbeab5p8o4bk9j5tnq2d78/domilunapimijatedupe.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/gepev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=coon+can+card+game
    • 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_off00013d72.bin
ff5ebc0e9e5ff757d05d60dd1c83ff71fead9c82c6d99232b3b67f76abf8393f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D72 17016 bytes
font_01_sfnt_off000169cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x169CC 16792 bytes
font_02_sfnt_off000181e3.bin
0f02f29e50dee30623eeacb2fb20354ae2a69ff7ae48c6129260c1c51751e865
pdf-font-stream PDF embedded font (sfnt) at offset 0x181E3 10340 bytes