Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8e53960e56c8ad…

MALICIOUS

PDF

90.0 KB Created: 2021-08-24 21:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 422ace15d40d1833ae6f20ab96e2a8b8 SHA-1: 713ec15c42679d5021ea1e937869fb80f9db985c SHA-256: 4b8e53960e56c8ad23b89fa356f064f87d10ac279e5ab31531110458942afb2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=biggest+ship+ever+made+in+history PDF link annotation
    • https://himalmanpower.com/ckfinder/userfiles/files/79612837799.pdfIn PDF document text
    • http://bienbao.org/uploads/files/17055807408.pdfIn PDF document text
    • https://eslms.com/userfiles/file/wuloxekarovi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b9580a8bd---71158664124.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/39e82d338435dfb75884f5d333fe53ba/wigoginegowovinivid.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161219288f0abf---vitigoruxamoxorufowowat.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607924719d6ac---febazomubadat.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6a5258f7---kibafa.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/67961786528.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/subasininomet.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160948dfe04e27---sisusatofinemipowodivas.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/lelilatigizolekadeximi.pdfIn PDF document text
    • https://haidangpc.com/contents/files/57717546259.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/73865388639.pdfIn PDF document text
    • https://ottopianos.nl/files/wobug.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f41d4920b---47889603528.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/43ad870ee87f803b5b58d77e5c4cf3a6/31236875105.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/vuzutogap.pdfIn PDF document text
    • http://www.asslar.de/downloads/wewedefawesi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/sgac6l7a59neok547flloh55tg/duripalojato.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/33533111403.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c825501fb9---ketudasizoporizuwigisilex.pdfIn PDF document text
    • https://jotelek.hu/files/file/soxoxodunup.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_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 11028 bytes
SHA-256: e6d9a67300f826e77812dbbbb61f13f251dc3ff8c52e0f0c93d43f3633fe1cba
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 16968 bytes
SHA-256: c3f585e485cf2d888573d262fa9aaea8fafab1d5e811c57f2ed064473fdfaf43
font_02_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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