Malicious PDF — malware analysis report

Static analysis result for SHA-256 2075c36395f63540…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 07:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db5bbcd74c228a2e4368c495be2f229a SHA-1: b811c379bad63bc576f2a604c19a43bdd49765af SHA-256: 2075c36395f635405ff6afdf749f17c4bd8926470f389b6757d3bb5208dd89d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload directories. The PDF appears to function as a link farm, directing users to potentially malicious content hosted on various domains, some of which are associated with compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chungcungoaigiao.net/uploads/files/75119577264.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160889cb28a136---xupilutapujazob.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/60237203253.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/17403536546.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ef0f8rcdiphheuh8rjiilrd0a5/98809322325.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/40108051498.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/58540968266.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096973dd9b0---wafanatotexurupazofitipam.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/26082106840.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1896013da2---3821934875.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/fc5619d084ba985c95a27ea5674f4d09/paxaropuwoboguvijikefof.pdfIn PDF document text
    • http://algeos.us/js/ckfinder/userfiles/files/bawukagidomutexaju.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ed1241e8b---mofuxivotadamipasugowo.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/paxenikoludomemube.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nimoxowip.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097148572b66---64720289340.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/91905383288.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/90651674396.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/adb40c535340658591227d81e640b93b/repesakas.pdfIn PDF document text
    • http://alptw.com/images/files/9584853374.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e83931ba---33436802105.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce96cec277c---nakosekamogorapudunogag.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lizejabo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160841e8f5b8a1---47663536225.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/45532621965.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa4c38cbf---81475761079.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/66316078729.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/37858328295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+mountain+between+us+book+free+onlinePDF 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10860 bytes
SHA-256: 634cedc0b76b033dae6ce67d416fcf9b0653abb942f0f95b4699327bf9b3a885
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 18408 bytes
SHA-256: 726c0934b6aff6615cadbd2344686bcc5b02fc7f04a9a802b2250fcc6f072498

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