Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5541ad7836486b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 12:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3f504990b1f6ae4c3544a7a60bc7c50 SHA-1: f4caf1088c8e461f57a7d4757a0e17e24612abec SHA-256: 1a5541ad7836486b3cb9892eb533e64e9253d4eaba97bc579b6f4eeddd8d70cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous URLs indicates a likely intent to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=walaloo+afaan+oromoo+pdf PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ac60e5f9---fuzefeforabopafi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5d436be7b---xababusevofejiripa.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/82286444802.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202108231321527472.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/zowusakejutofeb.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/gadatamolenoradul.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0m4g91epkrco7hvq3q7tme2mkm/64994300940.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a5b0a32b---nakurizopafuwapowod.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/63176602394.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5082f8dc66---60037065125.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/15597776469.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/52068961782.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a70839fd6d7036d41964a70e077ba992/62300619381.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/24276963740.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/mojivonamipivixikal.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/70598757172.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1edkeisrdjostmilo5b12kcdc6/woretifi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///27058642220.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ea1d61a1---mewonatotekinamuwu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/janonulemamufapum.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6nifnr9nh1s5omdsj3rpo5p7a3/jovumijujonaxitajuraj.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31509152523.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/91238171734.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a8d41797d6aa4e37d3b348772d3d73e2/ronat.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_off0000c069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC069 18188 bytes
SHA-256: d40c97bfc4361aa2c434094079d78f7be56313b069b65bb79a01d6132759fc9e
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10164 bytes
SHA-256: 3aeeb71e1c0df6377653dd9e09e8b8a063920cb6cac04ded7af20f885f0fdc55
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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