Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9b745306906739…

MALICIOUS

PDF

90.2 KB Created: 2021-07-08 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 673dec6bf4fe3c07a339921815a9e7f8 SHA-1: 7ca8c2954c08d22dea042bc228a7aac512538fb5 SHA-256: 6a9b7453069067399e8d8f0f3e5c31eeb8f8bd88212d65f7794046416c1290a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aivieksteslaivas.lv/userfiles/file/vajurenikefelajutijiba.pdf
    • http://davidlbrooks.com/clients/868292/File/zozobejujopokutove.pdf
    • http://gwhs79.com/clients/867100/File/dorisidad.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b7ee19964---95964523168.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/samudeximojakijositipi.pdf
    • https://acavacecio.it/userfiles/files/pokanozekoriwazoxubataniv.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076496e36eaa---99249276454.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed0c0fc05---3347398231.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r7bv4uieo136cp48b6vn8vfnit/mofusipuxamorusumubefap.pdf
    • https://scavilecis.it/userfiles/file/sukawejekokuvef.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/uf7pj2clv8mb1evk0g873oqrae/mogebovakoxixa.pdf
    • https://planet-for-events.de/userfiles/file/bivig.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d20d729836b---66272115571.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160810ac977170---22731043282.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ef1e6b2c---diwegedawowusomosobefudum.pdf
    • http://rosesrealtyhomes.com/userfiles/files/dubopagigakepukuku.pdf
    • http://aliceinformaticasrl.com/user/pages/8455169907.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce60284b78---35978067791.pdf
    • http://altaprecision.com/userfiles/file/dajemejozudajuwikedokudop.pdf
    • http://andlupa.com/userfiles/file/lenifurojetevepatavevek.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608448bc8ba9a---jedijevuzi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd65a246c6---zonowulofoma.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160708153586d6---wubagijula.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082310aa2adb---74775072309.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6l79f4611aaiqedneudv4bcri2/togopasemipe.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p5ik6s7p6mkf015rugdkbitu5m/giziwezezipuzefof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nrp+7th+edition+answers
    • 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_off0000fca5.bin
7739ece1973716d95cadc395c9520efd563da9abc18967b3b0523ebc6b3be0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 10556 bytes
font_01_sfnt_off000114c2.bin
114baefb8867f2b612a7cdbf904cf88f4b8a7d99b49c68e0f008f971ee58803f
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 17496 bytes
font_02_sfnt_off00014214.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14214 16792 bytes