Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25af0f798fd3c83…

MALICIOUS

PDF

83.4 KB Created: 2021-06-29 09:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e82db5cc75744785715727c4c45dd43 SHA-1: ac95f3e212bade93bc9693bcb036c55065e1cf4d SHA-256: a25af0f798fd3c839a3afb24f270ca001b9a7bb75084cc6e002192d39c914817
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://anthonyvienna.com/sites/default/files/file/60860712366.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80023999c---kufabiripi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981b238---rejimojurukotazudinuw.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/da3b365930d3a9e00bfe901ea39e1756/widinulimusupimav.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0bd4ce67849d2e0ab2e2085d06b22836/wusuguwunagokitagenoxej.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/adbf90ed580ac8016ed8599637508099/muxakevozutini.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b13442d039d554429afaca95f8b30d7b/7190524307.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/abc83a731d233591c12543d004712333/98174655117.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160727ea7ae482---69176381589.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c6d7a9f7---putuzibujovirebol.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/687e2fa480d9fed27715daa55b47f031/gexujozarapuruxu.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2a1855292c0f481f4596626bcbe0649b/finemulixeworebodi.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f468bf26f7c58bbeda0c04fc581a6ec7/10693359069.pdf
    • http://hoshitorionline.com/uploads/files/pemozowajawoka.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72c875c51---54386564564.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cc6738a27e0b4458752839dd92cbc900/70095557437.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2nmhptfeltmc8jjhf3eo5qqhj2/74246800821.pdf
    • http://ed-web.cz/userfilesfile/xukob.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d8026a1e54d95f5c86e2567e16e58f2b/18226188886.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2464a093---32588171481.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/kazebegobigaraxib.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2cdead83---fobajifepotajafojepag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kpop+idol+exercise+and+diet
    • 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_off0000e88e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 16792 bytes
font_01_sfnt_off000100a0.bin
642a07f5e9451fb7be9765b808adacf39d4deb56b5665420280ad26bf3f98aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 15516 bytes
font_02_sfnt_off0001282c.bin
9a84f8880ff3cf00089b31ba4181294b04faf3f025b1e496281b9536a4265dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 10600 bytes

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