Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a131d83160e17a…

MALICIOUS

PDF

89.5 KB Created: 2021-07-04 01:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84c08424659ade7e58a1d779625afa0 SHA-1: 36ad2445275386507557a3bc6d2598e7adbfbdf4 SHA-256: d4a131d83160e17acbfc894e9323a3c20b1fadecebd356814ef4a6fc805a4bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608334bbe82f5---9463041572.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa2571fc20---ziwazabesojoxuf.pdf
    • http://ck-tct.ru/userfiles/file/45598336854.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b33896be9dd92cc91c82fda696d4a22d/xemexoduxibun.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c09c182c7---94951759234.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fdo8gtl176e39rlt5b9f0itgh9/nusujififudus.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29da7810b---47387889497.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726eae5ad6b---46589151361.pdf
    • https://palcev.ru/userfiles/file/69805682847.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab0e291d---75698682641.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e1023151f74a12cf1c1bd88959962bf0/biwedebi.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/287e4bd98c1c1e9bd9f54486b11898a4/74595111543.pdf
    • http://smn68.com/clients/75339/File/11348291661.pdf
    • https://alakharia.com/public_html/userfiles/file/85246097961.pdf
    • https://fablab808.com/nbloom/fckuploads/file/27911347626.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4be8f1f4b015f66df4d477cc8108035f/690347332.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f475188d41726766a53af603e72745a6/vemawi.pdf
    • https://bititechnika.com/uploads/file/xunodoz.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/68234351836.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa0d32ffd3---48682641133.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/najebiwujujadisotubudiwe.pdf
    • http://seamcc.com/UserFiles/files/febixosazigagirutigetur.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091be305c410---zitolokemubajasowunu.pdf
    • http://botosani.ro/img/uploads/file/vuverajezijim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=install+office+2013+with+product+key
    • 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_off0000f4b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 16792 bytes
font_01_sfnt_off00010cce.bin
e9db32d3d3c7c59924f1d5f93ef6883a9ee481c78a68e27e096daa7eb56b89a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 11524 bytes
font_02_sfnt_off00012848.bin
69fc5678251de9e3de81cdb1bb21b34b4dd7321265cebc9b24d2ea54b2486b61
pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 17860 bytes