Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b4a76d3ad38ad6…

MALICIOUS

PDF

83.4 KB Created: 2021-07-01 21:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 249dfcf672f012397d9b06b015d9f50c SHA-1: 895963655f8cf463dd81c7c54c2a2bba8184f244 SHA-256: b0b4a76d3ad38ad654b50e0c98a0e126e9f73a9bc9aac166ebd5ba8f144c9454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true destination and evade detection. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e70877541---togamibu.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160906934ca212---zixijegow.pdf
    • http://skogsformedling.se/bilder_umeny/File/kijuparaxu.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/te0lo8c3f1m13f452305gqd4cq/28671840698.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/moxitukuvopajo.pdf
    • http://kibbkw.com/uploads/file/xivebalolamigili.pdf
    • http://demkapi.com/resimler/files/vuduposaxujifoj.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a52c89c903e---19509352607.pdf
    • http://hasici-pristroje-eshop.cz/files/file/jejininadewoja.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/09c11b7eb758f45550674aa8b79e0daa/binelimu.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fee403f6---84319525308.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6965a960b8---29321327096.pdf
    • http://soupworld.de/upload/file/gijesajaxeruzige.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cb7ea5d3---89445481747.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63d69e90f---98504766939.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mviagle98bn47slqetpplfu66h/faxolofisurapelo.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/962a1cbc71d02fa3b1ea8ccce49b2e07/xujepuj.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf76b97823746bc9cb7956e1e5aa30b5/88164117137.pdf
    • http://lideparts.com/userfiles/file/1622118429.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9926ee9c---51700914230.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3d5fa39ff---lijeja.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985870de3c0---jusibotobevoki.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cuumd59n9mm9jvociu6d9ttss1/gemurufokeporifusaxesepi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=a+pattern+of+shadow+and+light
    • 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_off0000e25f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16792 bytes
font_01_sfnt_off0000fa71.bin
94dac15f3ce872ae3834e28bada2b62c6d23e1e5f843b4dde916aedd6d2533f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 17268 bytes
font_02_sfnt_off000127b8.bin
1a53938dbc7050cad9a4de81e9c90cf1281a996cb37008732a6da903badad4e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 10844 bytes