Malicious PDF — malware analysis report

Static analysis result for SHA-256 400105c654f0a6ff…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 07:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c63a6dfe00471ae90ed670df8db8197c SHA-1: 2ecb4157039dfda4da8c3843b802230c6e5f123e SHA-256: 400105c654f0a6ffd8b99d7421473531c38e7e713786a4e76420521828e9a6bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://rajskiewakacje.pl/userfiles/file/mufajeromanemolewesenep.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/piwivubexi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/71605566061.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cip22o1op4uaq1kbhiodhu6db1/vitokugenaw.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/5777868050.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/57d26d438ee6a02a3de8ad34bb79027d/55725400448.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210914141007_1639195783.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/motegoviporu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/53840672355.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/bebiliripemaravikudidilu.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/65748382948.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/53545802511.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/voveriguviferepajoxugimo.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/tizurapuxefukigusexud.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gipakekelajadidepubikubi.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/zuzupedatarorugu.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/20895306815.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/5223557942.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a4694c12---60661759881.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/kolulakonewuzujiteno.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xikejomojo.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/76971959519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mulan+ii+123moviesPDF 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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 17512 bytes
SHA-256: 867dfb65aef4cb7607f6062614816ed37df5df7df64d21eb712fe847cb614723
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 10576 bytes
SHA-256: 7d7baaa2adbb86631ec7eabdf2a2ba7dbd0eb5f16fcd10abf13038b368719f47
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1