Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d676f37f71d29e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 15:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7f5e4cff7e765eed45b6443c0a4c3029 SHA-1: acfca4a601333e25981d60b06923b596d8586c73 SHA-256: e8d676f37f71d29e9fe0d90f225ba53a8bd0efffe8b4b8847116bd65c634ef7e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URI heuristics strongly indicate it's part of a phishing or malware distribution campaign.

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9f38f2eb72b07acdac76a6b0570bf03/64158436989.pdf In PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/e6e48d44be85b2d3584e7f75389448dc/powajitimepunavudajizupak.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/452abc44c1bef5304143a3714977b3d2/zixodolefozesivade.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f64d7925e---74514751509.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/92763783561.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/df53d48ff8ba757cb8a0cc054fa3b343/34417895841.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/tubureluzirewudadobi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/lukurerorepikimamore.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca04e710a2---jibepitetedexakagobete.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/kiroxaboxek.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/jaforakivimoga.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210814210511_469821349.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160814c15128b0---81600960537.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sudekon.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a321b6f86f---limopikavosimaponud.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/dozedogewifedamirosuwewi.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/piwixadetixenowowajapiju.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabaf9c7af---rumobikumakali.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/40530942908.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/97082500384.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/95092170997.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/nefipu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c851d06499b---wokitulabawotarazakozibu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/72875968820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=phase+lead+and+lag+compensator+pdfPDF 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_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 16584 bytes
SHA-256: fd9a32ed2e8da2faa0105f107bb430898f2d49905a157e1cb83ff608fd3f4246
font_02_sfnt_off00012fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 10976 bytes
SHA-256: 2a6b984f7131443133710665ab9be8478d064296576b5cdc283121b2edcc8eb2

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