Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef8f600938341e2…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 20:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e0d6f8d1dc7f2f1e253f4830a531714 SHA-1: f37e5f46d4f0f147144dfc2e4fb583ce78b55948 SHA-256: 4ef8f600938341e2d0e74243aee1bfe0f2932d5436e9dafa05929a5ff2dca57a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://krisoc.ru/uplcv?utm_term=how+do+i+program+my+directv+remote+to+my+bose+soundbar PDF link annotation
    • https://commonwealthsportsawards.com/userfiles/file/xalaluwuvefu.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/54711686934.pdfIn PDF document text
    • https://roc.mn/uploads/files/99727358915.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/koxiwuwerevojabel.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6748b3a7eee93729ebf4a108fbe8230f/mutizoj.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210708/file/16256952764345.pdfIn PDF document text
    • https://makenie.com/upload/files/tiwefanuxafunamareg.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/sutudonuruvopuxixasuguga.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/9778214323.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/a4fdffe419168490de6c8b588503be05.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6ad19c82ed18b5511cf7faf100dd0abd/98406092362.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/xewotuzuxikeje.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16077471738f9f---24430701786.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/lojeva.pdfIn PDF document text
    • https://mmszke.hu/files/file/bawoxozegata.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/63976076728.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/50150272045.pdfIn PDF document text
    • https://etadelloro.it/images/file/30724484144.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085236b53573---9224257862.pdfIn PDF document text
    • https://akvaguru.hu/user/file/81879017181.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/16098572662.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102afe819d---mumoliwivufu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f773fa95---15690390069.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d16e8ae6125b0efaec9f60787fd2de57/12636221579.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/25789877226.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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 16932 bytes
SHA-256: ad334e646c0edcfe452cc7bda76465a78b85ba4c46060c6970d866fcd798b551
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 11308 bytes
SHA-256: ef926a869d98e051141d824132097d175147e53766cbe52acf7a596217dfcc49

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