Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bc72fd226a6454…

MALICIOUS

PDF

98.1 KB Created: 2021-07-05 20:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 816b73111f84f91bbdf03a2a749e71d7 SHA-1: 67b5fcbd5e4acf499887e405097e9da32cb0720d SHA-256: a0bc72fd226a6454d0a146f116186f7625961b8b462010887bf574fd44bccd4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malicious content from the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc76c4c16---22141195053.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081afeecf497---surafibimufodefiparuvusep.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/fodijiwoz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/61fb66c563689a93b75d87473c717906/miwel.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/7605407972.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/952b9c6867a707aaa13827987c4fff52/15182552580.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/irosc1vtfbcnmpt9r4gabne51g/22476144467.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f93680d919f265cf41ff680f926dfdf0/49010313733.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d897d63665e---99269729642.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/91461413630.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8c4e5c76---mafaxixebamafibu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/musanuratazanuze.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/suompdfkjqumgcm8b4q6e3p2fp/ruxat.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/47605196857.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/mebojope.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839112269ac---kesipovuvowimerozepew.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/94ee915a1de219528dc1490723c8b5aa/59014765641.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/prcs25jdti2lnkvh07ksuaqle1/44367256978.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/8904770954.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/rojipulevonisudenavab.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210609_54648971C488D0CA.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/26nc8tit13reijljs1e6oob052/kunop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+graveyard+book+chapter+4+summaryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 16840 bytes
SHA-256: 687896fe16cf8ac09171cbcb8f44e660548a04aba2334ccb87f51869facdfe01
font_01_sfnt_off000148e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E8 11272 bytes
SHA-256: ff59a59a68067b2240a645074065daf3602af5a9fde8e8694e0aa641079c300d
font_02_sfnt_off00016310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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