Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ebb6eaec17e770…

MALICIOUS

PDF

91.9 KB Created: 2021-07-21 13:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e814dafa1478a494a0c957105f6b7edd SHA-1: 4a46572f05e9a7f5872d0687d4068c75ec14136d SHA-256: c7ebb6eaec17e770abed9ac54c645f053df661e803c45903a6a1cbc74b45f745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the non-clustered nature of these links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.prctech-th.com/ckfinder/userfiles/files/88285966982.pdf In PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/tejuzolepupux.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a798e10343---11142028163.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ragofonobig.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8894fafb6c---gavifase.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/15973785153.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8db828fad---65626011454.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/10832233115.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/dobojedu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tuzogifevilivepurifosikud.pdfIn PDF document text
    • https://soechi.net/userfiles/file/58877061601.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d039e4112---80164447484.pdfIn PDF document text
    • https://wita.lt/images/files/beguwagulepeji.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0389a2908995f5c22f54ebe31f6e006f/ledufipebe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f6330547---64616865101.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/bisidodemirumeme.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/il1okdq8btqhdqbutjqt3hdv6a/zidabijomudaboxufeba.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df5e211b5a6---pokelesidubotetudebaw.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/1301620722.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/lumafevuzikelanef.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b57cae9bca379e35412409defde24748/lipusesot.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/90598088422.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/ranulutapis.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b258f4103---besofopesoweta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=who+wrote+the+book+of+philippians+in+the+biblePDF 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_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 18980 bytes
SHA-256: 889183f263cd60553215387cdef852827c6b1b1268a280f207f29cf8b1d1620d
font_02_sfnt_off00014ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD7 10768 bytes
SHA-256: 97f21d4c17b2fd3a7fc46749549865386233c48c23ef7f9f8e173ff6ce4e0bf8

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