Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e3c94b98254eb7…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 11:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ad9ac41f106c8962e7ae23dda4d9991 SHA-1: 518cc9392dfd03fa3b03dd4669926277c75b6826 SHA-256: f9e3c94b98254eb73da12313cf4efa81514938ec5178fccaff8f1cde8a93836c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ohj10t464ke75kgg2cf4lm37dv/49646528860.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/20d873c11cf2c50d27ff7b3961ee184d/dixamu.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/73506238454.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c414433ed---82295411309.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/mekiwuw.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/eekbge6rnh43i25hfsefsd8h18/54534843290.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/30b073432e5658569b5ac41fa579f976/3830035766.pdfIn PDF document text
    • http://chayka-svg.ru/files/zefafezezeliwe.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/931731847.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/42854315074.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/82515978281.pdfIn PDF document text
    • http://didula.com/img/file/75768768929.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/93421910101.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/xudiwokuramegegamapawe.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210527_38B79DB35BA62932.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/7lnjh5tkegi59qcpgtm6a1m1mm/66993755263.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5c55bc43bfad06bfa7b185ba1577b69a/22080319669.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/mabisubeneguneguzit.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/97511097221.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3qdhikgeh36ehscpafjsmbblec/95269970366.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/68576532513.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c232da8fb7---33824766314.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/vagas.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/pezuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=glycolysis+and+tca+cycle+pdfPDF 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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16456 bytes
SHA-256: 854d04fabf9695e274c6f08fb96af96e68aaa36642d0fb5f43033954c294db07
font_01_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 10668 bytes
SHA-256: f2c4105d6f57c9ee9b8a1f9cb6b6f11372fb7a5007a406bfedde4db2ec361e53
font_02_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1