Malicious PDF — malware analysis report

Static analysis result for SHA-256 4653b702017361d1…

MALICIOUS

PDF

84.6 KB Created: 2021-08-19 15:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0250840ce6c0ec55a153a4ff819ee370 SHA-1: 6d44c13bc13f8587e3ec870a7fa2e159019baed3 SHA-256: 4653b702017361d13289a44dd8e5ab0b59eacb8375ba9b4859d0f035a8ad581e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=mht+cet+2018+question+papers+with+answers+pdf+biology PDF link annotation
    • http://bygreenpure.com/userfiles/file/67803643051.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055ae64376a---55662681856.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e930b7a325a4567d33fcaa4d0530e7a5/pisowezizu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5ec95f308da9e730b8802ac5a3c37e32/pigasojukejojidotajuma.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ce23fa7d99693e5909329b786ef9f0f7/68143286255.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fc50469492521928873b095f85d298a3/83874296350.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/ponegodiz.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/rosujopuvaxire.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pemogusufivo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b86325f00---lemiruziraforebomojofo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa7094772---59384608152.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10532520284.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984de48f43e---51213459681.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8ff9abcd---93775514651.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kosevesofabuwot.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/63981260343.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/gebazakajigi.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/4fuicfcb88lt1lmup6527hduu5/suguxukesasiwirib.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b108df3673163783d58c181a20191a63.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ec8d019c3f89dce11caa84080909333e/dujewugozupajasex.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/91a0posataa2ieh9krn2b6mm4b/rusofitavunerisoduwekataw.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/15365087489.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/93456277559.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vakijomenimeb.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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 16812 bytes
SHA-256: 3e948bb4e76f4368cf6facc7a5b1fefd302bcdaef33afe1afe1eee6bc7bb0cd4
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 11980 bytes
SHA-256: 81fd7160f2700c6aa5855045ccb92563fae0b0b65fa4974a48f9d7a01091d0c1

Open this report in the interactive analyzer, or submit your own file for analysis.