Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a4d92a17c8dc87…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 00:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fae42e33346c37e7beb19e4d476bb65 SHA-1: 1b62679d47cd7593a108065f28558d89541049b3 SHA-256: 02a4d92a17c8dc87b073a56a811e68b3e5ad381b703ea20fddb6107faa9677c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The 'SE_MFA_LURE' heuristic indicates the document's content is designed to trick users into providing sensitive information, such as one-time codes or MFA approvals, consistent with credential phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://nomylo.ru/uplcv?utm_term=gta+5+free+for+android+download PDF link annotation
    • https://sistemagestiondpr.co/userfiles/file/52274445698.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4a470fdb---buwejutebozitizusumelip.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/paxeromokan.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/sojifadasefoxegumis.pdfIn PDF document text
    • http://futboltotal.net/images/files/sutulobuvidabava.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/vebuzapagapafevekemufagak.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/menupusud.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/zalabemuruxomaziselilo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c89a9e1f28267dc6cb274091c0e1b189/27049151049.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/10537369468.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614514e4ce615---8742546991.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/ziponuwafaji.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/50317772686.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/filosinunu.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/wemutejarogawifixavaxome.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/21463187594.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615205360bf70---65429818426.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/58350273003.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e04c3c345ec28c49d184ae50f965bfa/tixipinepipowajobajizema.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/91122693433.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/kawole.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/jurobo.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/87447149126.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20211002150804.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/26618409879.pdfIn PDF document text
    • 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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 16028 bytes
SHA-256: ad2600149757eaa3a0c51b59ec8586fad98db4f9a368a4daca76d36bfade338d
font_01_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 10436 bytes
SHA-256: ebb74dd569e35bc8eacb7fe5bb00ebee3984ff66d589cb1ab6140bad7b4aa87c
font_02_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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