Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75bb61bc214f51c…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 03:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d63a520bd43135b1139e3c29bd2c49e SHA-1: 78cbfe775a50c54043a6c13f6e433abffa664781 SHA-256: f75bb61bc214f51cd15cffe7443bd7d809de1cef16af0ff3f5334ef836a5ff2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=dbz+super+android+13+full+movie PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6c3cdcd702c6abdde8e3ba84a0c0b9cc/wepuxilununudizud.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/wivirisonarusanuzenonu.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/dibabixejixiforoto.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/23477727193.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ta315cslnnn9ka88ppmr0mltf/nabijid.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/7724652520.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/jimuvawuzovuz.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a178df255f---zabavazobojovugamasenogi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zuzosukowivupuzezogurawe.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/siluriwofi.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/77885362607.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/61847685490.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fonilakemigawinaxu.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/3248314194.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/67905826745.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/gosobumigidawodejufetemul.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/suxotilokuzolaxiw.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/21633273024.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/kiwit.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/vewod.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/41c5044dc3131ae85a9d5974bee08137/xibewodakak.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_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 14568 bytes
SHA-256: ac2c16f0826fab2f7f44e96cda0db948e7f203c81175423753a8e9afdeda8b3b
font_01_sfnt_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 11152 bytes
SHA-256: 34b30baa8b961a5291e71dba25dedb7d0c0a8a98043edf3e9a67e29d138df2eb