Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e985d04be663061…

MALICIOUS

PDF

73.0 KB Created: 2021-06-26 09:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51cac4bbb3dc7c443204e332a6c569a1 SHA-1: 1c40d996980d0ca462e7691a86219e6bc6f4ba4c SHA-256: 8e985d04be663061a5ecd0bac3e35ac53399cf270de2b3d240a43f01a2ce0377
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://shinies.ru/img/lib/file/sevedosezejelige.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f330a4b91---lixituno.pdf
    • http://bukharasuwanee.com/sites/default/files/file/gewemidedajoninawifevusi.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/edc9c470f1ef25687e89da90d10bee43/fijuresiwedi.pdf
    • http://www.aportecnica.com/imagenes/editor/file/kelip.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/54dda02e58e837c7118961e0d17003a2/gudidudonudobam.pdf
    • https://alarrabnews.com/images/content/content/file/fomepa.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071258046e5c---99103370400.pdf
    • https://sofupingame.com/calisma2/files/uploads/vatilafiwozapenifofexoniv.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f6d1023b---10282529261.pdf
    • http://sunrui-ti.com/d/files/petuxijegosazavep.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/370ec55e54f9591eda6574a53ba0bbfe/xotorozukiremumev.pdf
    • http://gemculture.com/userfiles/file/xuwamemej.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5f64c02cdad0e70e6aec4fd6fe28be63/49628246921.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9fe4412e46feb0a8a7a1655c9d36cf16/70584529504.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf08481752---99973553221.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607848cab0229---wesofilulinokonutibozawid.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16c19ee43---19914573683.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31a0ac5cc---pilanif.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/g2do2e2de0457qu6p70bt7v7sc/23233688158.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hioj32vc212ev89c535fqq3igj/37121788959.pdf
    • http://bookblog.kr/data/file//files/53225951029.pdf
    • http://dspace.conacyt.gov.py/jspui/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=thermodynamics+in+nuclear+power+plant+systems+pdf
    • 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_off0000bb13.bin
9e91d8e19a64c54e40dca223cef3acf123ba0b9351cf8e0cc9dc5d8efaff5cf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB13 11148 bytes
font_01_sfnt_off0000d508.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16792 bytes
font_02_sfnt_off0000ed1a.bin
918ccc6cc440c495f65afc946c618ff62d773bee59775d8d0a96a982b606d92e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 16060 bytes