Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0ac77353dd9385…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 20:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f154d1c53cd778dc1909563970b4788d SHA-1: 05c0df229d578cbd2685e94ee1ce6562e09b3e60 SHA-256: 9d0ac77353dd9385f642be828f3b7d695b913a366258f6809e209c809c0c5b22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tjjjsh.com/uploads/files/38703152715.pdf
    • http://travel-door.com/userfiles/file/72938975015.pdf
    • https://samudra99.com/contents/files/radew.pdf
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/kopubugemasibizeg.pdf
    • http://akvari-um.ru/userfiles/file/sifaxoxetixug.pdf
    • http://mhinflatable.com/upload/file/futarurutu.pdf
    • http://ccswcd.com/userfiles/file/nomapigotofikalibapefex.pdf
    • http://househouse.it/userfiles/files/pasoxasixejowesenixu.pdf
    • https://cissud.com/uploads/ck_editor/files/7515631973.pdf
    • https://coil.hk/upload/files/20276104777.pdf
    • http://fmmvn.net/userfiles/files/wizizusoxotudoba.pdf
    • http://mixline.ru/img/lib/file/kebotokolavibil.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9bcc0db36d67405aef09ba3799fe11f0/30384902723.pdf
    • https://pecsikult.hu/files/file/34238232584.pdf
    • http://zopos.zohukum.com/ckfinder/userfiles/files/duwalidegusi.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f841bc534c---nonexebasowusoxabu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc71ae43bf---52916955302.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bba6384435---56358744387.pdf
    • http://giovanniseneca.eu/userfiles/files/37192826632.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/gejomunotasotefe.pdf
    • http://cochemical.com/upload/files/65708017178.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/nalujunopoxuvowamejoladup.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/wukaragiso.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/zokukumumajojitiganusur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=trasferimento+file+android+su+mac
    • 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_off0000dd82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 16792 bytes
font_01_sfnt_off0000f594.bin
1eecd1594f4b2078710b0af05807159aaf57bbe57a5727bf6d6c871cdc62c311
pdf-font-stream PDF embedded font (sfnt) at offset 0xF594 16936 bytes
font_02_sfnt_off000121b5.bin
4e8b52faa6cf0b30c93769562fe7ad7e3e7907d94a95ec6e63da85c02d5d368d
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 10700 bytes