Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c4627b2370dc4e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 11:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: be814f14aa5af19b70f8d98efb7c9f8b SHA-1: 37636a937d92ffd9153b7c2242110f1f56a7d2e7 SHA-256: d7c4627b2370dc4e870bb5eceea1a6edf5dbc1ae523e00b80dca68c73bea3afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, characteristic of a link farm used to distribute phishing content or malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

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://irlanc.ru/uplcv?utm_term=ambientes+sedimentarios+continentales+pdf PDF link annotation
    • http://cokhihoangvinh.com/uploads/userfiles/file/8024504697.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/st435fvga8oo2apvbg5l9mq9bg/sizibojugip.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/67170410066.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-29/images/files/difaber.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d669e152---sufot.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/pizujofuzilogumarig.pdfIn PDF document text
    • https://onecre.com/images/content/files/juramadowa.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1019cjr8rdk7isb9rjno8k1fuu/zirevode.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/vozufalalakixiwokonifu.pdfIn PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/gunozeri.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/91953621816.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/xilawujegozima.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/47368324405.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/59055776827.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a942f80506f---sufarubadu.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/63414784921.pdfIn PDF document text
    • https://jobtiara.com/files/files/fitilopekak.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/76259657302.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/19323467003.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/98914186037.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fv9jjpo71bbbfhp7b4t5vb4tcl/jolazojuwafigavegipenar.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/57231779106.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/jolaxekejezolufidenuguje.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611492c977525---75471771797.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 10904 bytes
SHA-256: 9679a0f99f0f50f91ff5b8d978bb6daa4a8760351a412603d375c79fcee069e1
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 18856 bytes
SHA-256: c40196c348b7ca9cee97af174776177c85e209dda936b37a9353214710ce2eff

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