Malicious PDF — malware analysis report

Static analysis result for SHA-256 808c537175f73f75…

MALICIOUS

PDF

98.9 KB Created: 2021-08-08 19:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd1bff43d2a47defbeaaa2895a293db7 SHA-1: 1bc2460745656462762e591d942ff16526c15827 SHA-256: 808c537175f73f750329e8ba817dbb3d5d11e3acceefa8c743dc412bb23dccad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

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 https://hmanagement.net/userfiles/file/90233244338.pdf In PDF document text
    • http://orvosvalaszto.hu/uploads/files/77320246659.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a783a827bd8---78089248035.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a822bb4f---83183484495.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/woradaf.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b55cfbda9d5c8b2183af721d4f4ca08d/wolugixati.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/92403891716.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb350a24ab---kusigidajovalenimufi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/47af75b7a612a4c6e783b1b2fd4a762a/58484516808.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/18398340587.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c1cf9fd2694694191b475ca73d40c701/rigodulasigosuletewodow.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/fuganomigemew.pdfIn PDF document text
    • https://masihpt2.com/contents//files/77275591858.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/82421411856.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d26e53f5---9372549905.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a757ab9ef10f39565aa2e77b9dd28be6/xemanodi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4ea1f4025816af9d175bf87a66225540/39169905086.pdfIn PDF document text
    • http://espwireless.net/uploads/file/dulefuwepowam.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/99846839323.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/tibutig.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/misozaxapedajatuwuran.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743890d460---27084143084.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/32319711904.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/eb0018e2d21dc2496b2c5051dba4ba43/potuwenuzetekadabov.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cb646976ceaafd747a3b53e129cdfa48/93941446662.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/72919933095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=realidades+1+capitulo+8a+answer+keyPDF 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_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 18088 bytes
SHA-256: dc759729776f1fc491f8a5c2aabca93f2e72157795249d33b46431084106b6a5
font_02_sfnt_off000162ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162BA 11204 bytes
SHA-256: 8d7286b25d03144e4f8a202459a261378f944b6ac60a281fa85627b9783d6a41