Malicious PDF — malware analysis report

Static analysis result for SHA-256 634e080752115f51…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 04:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dba9603074343d2564c5c3482e542720 SHA-1: ce9a31f89cef2c9f3f8cf5daccd6d2481aa8f91a SHA-256: 634e080752115f519dab06b75eca83670be938db8f65f575d742d6b30321a889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=valorisation+des+d%C3%A9chets+agricoles+pdf PDF link annotation
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/0f27ka3n8c2vh8rk8v07078p99/kidoja.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/senejeviwarijowa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac872b4e6b2---powititoludu.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/besamolazupuwamutireve.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lujunutofejesubu.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/joxifogogonuvow.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4d6cebfc1---tiriv.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/54725875276.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/17594381980.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/tanuturuwa.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/13240036960.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/seripabixugumititudawe.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/67071645194.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/55810450636.pdfIn PDF document text
    • http://mutitar.com/user_img/files/mizani.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/gedipavekofaxudevasi.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/bubevasogumuladofidojese.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/909024e62f25a6444af2dd417b75272c/87797982971.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/omkb9u0ctvgtu8a1qaus16d0ad/fitesilazipa.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/af262c68c938f32192229536fb4c78d9/95516695262.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098433b2e865---52686426157.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/64888210485.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/snv8i62hupnmnagcrr79uei597/kasofune.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/fegemarumedibus.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/84047969700.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_off0000c1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 11020 bytes
SHA-256: 46a6876684abdab1854c15714a5256d37b0d88a9028948775b4ac25d98a2f72b
font_01_sfnt_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 17860 bytes
SHA-256: 80e5e355dd89c8d6edf3ba31f1e8943d1704c7de10ca7efb9d061a84969a7bfd