Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ded6de4e82148d2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 08:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1cbbe65ee25f66859d4a3eb5f73a5ad SHA-1: 0f3e3732d476ce4e376d9389255048a20c6e608d SHA-256: 3ded6de4e82148d236ef8718cbf919de92b5de1ff91278eb0d3ee1d1b12976d1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=english+stylistic+devices+list+pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610bde9993de2---vusilomonuguze.pdf
    • http://micronforgacsolo.hu/UserFiles/file/jibopoboguluvilojofoxeri.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/86571517593.pdf
    • https://tsegypt.com/file/zisugo.pdf
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/fefomuguvaxosogafifux.pdf
    • http://www.gamylai.vn/uploads/files/zifefe.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc75e3cd9---35032840237.pdf
    • http://amon-syotengai.com/userfiles/file/desawujixexepetefipu.pdf
    • http://orderkiwicafe.com/uploads/files/78720541394.pdf
    • http://tlxzkj.com/uploads/file/150523275107.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/setezofis.pdf
    • https://koncnc.com/genelresimler/file/52321076597.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qe76m6ra48pdqpgjemqphhgqo2/63524274868.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/93b172dc8a37423b1b57be671d14183b/64287983166.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/8fvrpu7c9mkf3a6r2he35fpaa0/pataromedojul.pdf
    • https://banderlogclub.ru/Files/file/40598880297.pdf
    • http://bnblspecialities.com/userfiles/files/xavufalidapem.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fdba2f50---wefelotebazazas.pdf
    • http://peaceinsrilanka.lk/userfiles/file/14636284093.pdf
    • https://faktxeber.com/resimler/files/80205495370.pdf
    • https://burgas-remonti.com/userfiles/file/13268529187.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f344439eeb212b8da5941320fdf9a21b/69509742873.pdf
    • http://allnatureint.com/userfiles/file/favenijidifakuraf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b4.bin
ab2f73f6b746c3ae0b3a3f3c2b3d343d3c5aadde23e10fa87aad9cb27d301469
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 10680 bytes
font_01_sfnt_off000101ea.bin
e94aa9c105ee0d4939642d7d2d3176cce9c4dc2863b11dadccca4ab924433e62
pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 18332 bytes
font_02_sfnt_off0001314f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 16792 bytes