Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c92aca9c6e3e2d0…

MALICIOUS

PDF

88.8 KB Created: 2021-08-10 03:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f0bf4a6fd481274e06b81ebc212e9c8 SHA-1: db822abf6fdc23fa8bce40fa00ae587769985fe3 SHA-256: 8c92aca9c6e3e2d08a2cf092319cb01a98d074be0efdfc76fc590a106faf70e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cycling-software.com/files/file/tanatotivadefalilujiruze.pdf
    • https://karinbentum.nl/uploads/file/nebawalaveg.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6f6e0b5d637b65feb0bc51043208822f/77467728727.pdf
    • https://bursac.net/userfiles/file/numufemiririnoto.pdf
    • http://palenice.net/obrazky_clanky/file/56663827734.pdf
    • http://dzbnf.com/upload/file///37308531862.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/blejen1t31p9nkmqbc3p7bu0e9/kexewujojefake.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2f00993b912449ef0c2cff67524355bb/nukilunepokimogokugagirig.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c1bcd20c925c2846c862e414304b3fb9/4832792068.pdf
    • http://www.agenbenangbandung.net/file/jupidadapujuvimofo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8pbc6umf8sfqtoftb0370jq0t7/79256419526.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414ba8e764---99758975183.pdf
    • https://anfauglir.com/images/file/94544634153.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/rosolodubisotir.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/boranasobatafef.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9bc248f4---10434945401.pdf
    • https://hmanagement.net/userfiles/file/15212982795.pdf
    • https://eamenfaraz.com/cache/fck_files/file/91935403883.pdf
    • https://jaiminsales.com/ckfinder/userfiles/files/860834065.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizumewex.pdf
    • http://biomisszio.hu/tmp/35170938582.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e58fd123580---momijudabodifubumulazo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f821bd954---lumagomoli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=abbas+inmunologia+9+edicion+pdf+descargar
    • 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_off0000ebc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16792 bytes
font_01_sfnt_off000103d8.bin
112630ffcc8326843f42154d2f815ac89d787d1d50598cad45360a76a2b04d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 20820 bytes
font_02_sfnt_off00013984.bin
4b999d8d24618b50385e3f6b787a7913c7f9541a87126e3ad9dd32645cc23703
pdf-font-stream PDF embedded font (sfnt) at offset 0x13984 11256 bytes