Malicious PDF — malware analysis report

Static analysis result for SHA-256 3047a76d47f2a257…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 05:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9c1cdfbc29630757c55cc0718141d5a SHA-1: 98e8a3e87fb1b6c827a88e28715346b2d34e5146 SHA-256: 3047a76d47f2a2572ea2acb09c659283b08bc02e80ab0f08f79894a5da2e1606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n2fp7pod1k7vu3engmm29vogu7/26307063915.pdf In PDF document text
    • http://dent-pro.cz/pic/file/17057459954.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/pifebi.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/7448980086.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/519a612ba529623a2f3dcde460630fdd/fapolufitoxejunesa.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/3835836563.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/pokakegarapufumidoz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609140553e0e4---bawuvaz.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/1417719128.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3798f96a6a07c2f53680f8c76f2a42a8/50564094508.pdfIn PDF document text
    • http://unibox.lv/files/text/17969794020.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09da07f0d1---xijibesaworugiz.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/legixuki.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/16f8de2b71e6c1fe338b9d68c6b64204/90768051585.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/16609988735.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/pllh2b84eni81d3e7ig2fo7n7b/nibusarojek.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/sifulok.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/muriketiritovafejimofiwox.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/6511481949.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/legizamasewanalet.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/63087648909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cadillac+escalade+2003+owners+manualPDF 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_off0000c66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66E 18216 bytes
SHA-256: b8ea6134502e88fcf536f4dd93a714b59d8192b4fd0a6a2da220517f4eb0f4ab
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 11064 bytes
SHA-256: b4ea3d5fb2581973d5a8ab3a61db6d7839da532ee808c3517e3eb1f554f38c2f
font_02_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1