Malicious PDF — malware analysis report

Static analysis result for SHA-256 17397574a3ce0ac8…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 09:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13b1632a7f0afc499dcab6f3e56a2ea5 SHA-1: ed2f0118fd8de6c050c976387cbfaf3a18ef4e07 SHA-256: 17397574a3ce0ac821f9cb6b37c31d6eee9e6b0713aeafe5e7cbf9ed57af6876
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these embedded links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=popliteal+tendonitis+after+knee+replacement PDF link annotation
    • http://registermycompany.in/admin/userfiles/file/11536132208.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ac330a429d5ab677e2fa173e17400640/timoxafiwuvesaj.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/80sm8klova3noil5l9n4jskat4/zenilupix.pdfIn PDF document text
    • http://spharma.ua/files/file/wigavokodakoz.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/jisanutixakedonemozux.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eea33de894---11329111460.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/72700753687.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/dc11b2d9c4441c9f2e7ef89d505c45a5/pazugofutiju.pdfIn PDF document text
    • https://edex.co/userfiles/files/nibakebufutizegepuworo.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/xovakurotepemekudo.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/20406308751.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/jededazaxa.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vasabenewobukefovuret.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/fabumegegerilitipeda.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/77984871130.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/fixof.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/lojoberuti.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/67562155790.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/13219840955.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/77350993194.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/dujejubegevumolelizifo.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/wekup.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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 16616 bytes
SHA-256: dec137c2a62804a3e56bb2feee2e4e80b244e487a86e9efeadf8b0ba5d1a5c82
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 10876 bytes
SHA-256: 7820e147ac8f43f1f91b872c19ebea6b93e0338da668a5fb982bda01e56a4789

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