Malicious PDF — malware analysis report

Static analysis result for SHA-256 264775b6899b6ee4…

MALICIOUS

PDF

91.3 KB Created: 2021-07-22 15:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52d2e581bec08d3c1d498d5acdfdb97d SHA-1: 09b968ed9ebfbc7f839874b377b98ad470a33ce8 SHA-256: 264775b6899b6ee4ab1ea5586bb162b785473532352995a552ed3c9c1ede1902
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c302799ccea---gezinofalilijifitodasowe.pdf
    • http://unipsyclinic.com/userfiles/file/20210520164754.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715774c74d---16796867417.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f566fbd8c1---gubaxegugufalabuwanusuze.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7054636f1c72d559146dd52458fd5f8b/kigefovonuwavulo.pdf
    • https://adasms.fr/userfiles/file/55974036861.pdf
    • http://baigeleather.com/userfiles/file/ditizonepoma.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ct874rh0fmps6jgdpdk8iv0rnk/67368936720.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ac90fb84---32310702322.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/negoxoxaj.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/42776719033.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/l8sd33gb87j11k0cni0jnganor/tagopirikotizemaluwidi.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082803d3d91e---sisokujonakifupo.pdf
    • http://alliance-ltd.com/userfiles/17066875779.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e265189c838---72661646254.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f49f8f5b81eaf5149ed4794c81b63961/gebox.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tfhh99es1ndd52p8bf3p3si3a5/38666167747.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4c23ae9a---53680009438.pdf
    • http://transporteslaplata.com/imagenes_web/file/tupeta.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6e5dbdeae---neradawemabipenikudufalew.pdf
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/84346829638.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=6+steps+of+the+scientific+method
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010290.bin
57fc7b3eb52d6aaa72c82e7e2949a4ca1b9aad0d3d355b6125a801100de13c74
pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10648 bytes
font_01_sfnt_off00011ac1.bin
5b72dadb072ec5b40281ad89a40ce50f12438fea6a43bfa7f72905cd977a8977
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 17124 bytes
font_02_sfnt_off000146e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146E9 16792 bytes