Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4bc445b437886d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 12:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca4d541de82f12c6608b2730fc4c59fd SHA-1: 770fbf0f8b830aafc3d3e5ead9cff5d0e701dc6d SHA-256: ad4bc445b437886d11bd09b79a293d623b12c52c9791c5c1f068210a54ed6d10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised domains and disposable hosting, forming a link farm. Heuristics indicate these links are likely used for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://designbeginnings.com/upload/file/vavigapeta.pdf In PDF document text
    • http://henzefashion.com/userfiles/file/kefuv.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/43467046919.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/fased.pdfIn PDF document text
    • https://electroagro.es/pub/files/68207256455.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/14169440965.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec884203b8---xunazinifejedejoz.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/nepivulo.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/logesasuwezasezako.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142d77cd8d1b---zowikupejiju.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/mufuminefedukomifuvepar.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/sezuvivogel.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/36530954943.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/65973831927.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/97825886433.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/22231580814.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6c6ed1q7jd0pf7vjh3e9c7pi8s/pupimonivegalasuka.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/84999695313.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613591a4656d3---jenufebakamofi.pdfIn PDF document text
    • https://aromamarketing.md/img/files/kipuwa.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/90948768768.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/451ac9bb7aecdf4f7dc7b09e5c46ca86/24522085146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+video+from+android+to+macPDF 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_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 17668 bytes
SHA-256: 694b6a97601bc661cbb3c8555c48e5e0614e152393b24556e1651ef359dd3e43
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 10732 bytes
SHA-256: 4322513e7fc60f98d6b0960e625a15a62c9a9c5905eee904cfe953a5372c213d

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