Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c79efd4e71782c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 03:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49279fbc9ffa879547880b3323c961cd SHA-1: 4b46b51f93b176fd59b6d90d3db8bdb282594420 SHA-256: 07c79efd4e71782c24c2a1bdad0b48d92046728a65c13dcf73921871d019bc3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed for SEO manipulation, further supporting a phishing or malware distribution motive.

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 http://unicaconsultoriarh.com/images/files/98582882218.pdf In PDF document text
    • http://alhambra.kopanramen.com/uploads/files/lilesot.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/92931593249.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb7b0354f---62679313195.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/64424990109.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rejabuladire.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/dixopojomiterojupiki.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/84355380102.pdfIn PDF document text
    • https://synersys.fr/contenu/file/87514748942.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4db7b0219---lunok.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/obg9rsk0dbqdslv82lf3je9iq9/77555390668.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/romisuxiwav.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/21028406947.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/risuzoxafi.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/11164610768.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/46607737158.pdfIn PDF document text
    • http://muszempilla.com/files/file/62518858981.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/22522115306.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/7384726932.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/wusidobarezigekurose.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/sezedalefufetogepesigap.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/radapovuro.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/20952421876.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/lifemuvunenepoxotunukawip.pdfIn PDF document text
    • https://kawanmto.info/contents/files/juwagojuwanitiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=toefl+speaking+book+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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 17004 bytes
SHA-256: b63e4c7eff187d079bc3221e69f24bb70438c57a01c0e0940fc952a5f8fa0a78
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10672 bytes
SHA-256: 7f16aca85596d95b779d009786e31ff503a9aa34948c154163d4c7262e87a8ae
font_02_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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