Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c72373d316e89bb…

MALICIOUS

PDF

90.8 KB Created: 2021-09-15 21:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0542e688107cdc48b8db07171aebf02 SHA-1: b3a8473baf122a2758f95e12d76e4c5a16d520de SHA-256: 8c72373d316e89bb36a93c18fe979a8aa95471a7fb8668500de1e3c21cc75aee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=battery+stats+android PDF link annotation
    • http://traktor-tv.de/sites/default/files/file/37533724848.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/8toe387ni91m3fsc8lau7d2rq0/97695085378.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a2a964ce48b3f2623e6f3052d12b2c37/28376955471.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/gijilu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/48cbab01d0591bbc754b196e14e910d1/guvoverinewoxox.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e38507a9e---1632193399.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/lexefejamufokurabubuzoxu.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/notovulelakajiveronaxisej.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613639a359195---5937893969.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/96407386512.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a83056d44---22601857995.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/61015397887.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/rufinule.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/89623938601.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/525f907705e8f4b588727e8db58ba15d/68557750701.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/zofimikejuwiwiseperujeb.pdfIn PDF document text
    • http://ned.ru/uploads/files/88064656357.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/12071441775.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e120bbab51e1835b9abe0630fe5772cf/69060764740.pdfIn PDF document text
    • http://zzquansu.cn/d/files/70926380117.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/58207177898.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8d9162c5205a765a3d722337d55ef0b/juluzimufisani.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/zeboxolejilewosojizibuvup.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_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 18128 bytes
SHA-256: 2d4afccc689fa9069a06abff47979a338fccb05dd02c69c7ab5e8c00ba14044e
font_01_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 10360 bytes
SHA-256: 0abb6fc4a6988880e945efb7b65c96a681905288f5fee04830aafa7a89e20cbe
font_02_sfnt_off00014552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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