Malicious PDF — malware analysis report

Static analysis result for SHA-256 7735f183874a62a3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 03:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7c0b7d2aac26caf3899a2a9d17d41b6 SHA-1: a5325791f76b9dea3984cfca9b882c29d1056dd8 SHA-256: 7735f183874a62a38acec6f8ea7440b3735d64f7d598447ff8cfaba4a0e8a205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple compromised websites, designed to redirect users to download files. The presence of numerous links on disposable or compromised hosting, coupled with the ML classifier and ClamAV detection, strongly indicates a malicious intent to distribute further payloads or phish for information. No scripts were extracted, but the structure suggests a lure for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c73402b88---10955216796.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d78904e1---31943923206.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab391a8f435---sebebeduposedij.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/97086825228.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a25dbdad5a8---22764894698.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/parudawinigivubima.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161239006ebda2---kuroj.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/31u10uf47kmhncv2f99h8urgm4/karesefotikenotegitipi.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/82027687589.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/kiwifesaserejedon.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/igss9ek9l27ravdfn8nbc7s0hh/kababutirorefifesasogilos.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/eee138ad116c14b3c1455bd24dd9724b/tatiladaneritizuwomi.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/pirefalokapuda.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/20049057593.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c109db331a3fa8bcd49af450fdc88e5d/sutebefexudufuzobixapixu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4d2161131---ziwolotowed.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/mewusadupebegigopif.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/86300615297.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tijebotogalo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e304877d7---dutujefemase.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81986c1e0---10519515410.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a8fd676f6e0c9c5ed840819c9412b2c8/81105114592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=summertime+saga+guide+pdf+downloadPDF link annotation
    • 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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 18096 bytes
SHA-256: 5613a58ce2c1dbac1fbce0f132452b7f9fa7f8f3400c5309f8b0b26838273fbe
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 11100 bytes
SHA-256: d30b11f7c22a2af62fda3187149c9868c55e170568c90dce7901e183995de648
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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