Malicious PDF — malware analysis report

Static analysis result for SHA-256 85be729e72c0008b…

MALICIOUS

PDF

77.8 KB Created: 2021-07-08 11:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e62ae4c610738a5ae220fb6ad1b28b94 SHA-1: f7e6e23a13077a70ee6f5187dda3328221cd5d5f SHA-256: 85be729e72c0008b489fba1ab8308c0903d55e641f2cf52d753cb41fe74a2eb0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://marosme.ro/hirek/file/wunapesasapo.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1a89949a039641f10533f1f52b667c6e/muzitidipa.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xubajevixowiges.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gngqp7suebd2s4v5l7dbtlp6p7/32973309499.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1a487ff0aed850d6040975bc377d2518/23719491766.pdf
    • http://nhadatv.com/webroot/img/files/18453010318.pdf
    • https://fablab808.com/nbloom/fckuploads/file/bibeviparu.pdf
    • http://change4best.ru/upload/file/90704540297.pdf
    • https://mszukam.pl/dat//file/wovabotidexiwe.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097822ee64bd---73680450085.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b329e1280d---72778535315.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80cbeec9e---pureguv.pdf
    • http://nature-revive.org/files/file/kozarafodojusisojujew.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7c2bba59281a3e20254e04e709cdd7f3/zemosasalese.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/706729f951c7d39712ddda3dce149310/gawefopikuduw.pdf
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/97965293965.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b5940e4c3cf---dulovatinazoniwap.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2c059212a06778830e48d38f4775f824/tijedufotukuketupaw.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1ce0958a08b3189333ce32d5e67b0e94/21475235902.pdf
    • https://ivanamihic.com//files/16350974895.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608692343210d---gozuredufolagifulapura.pdf
    • http://rideco.hu/upload/file/ronoru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+pacman+game+on+scratch
    • 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_off0000cecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 16792 bytes
font_01_sfnt_off0000e6dd.bin
c34da5597f2e0419efd46106cf13bb9c3b1bf1c50105646219bad86e2e80c1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 16420 bytes
font_02_sfnt_off0001112a.bin
0ead7b2306ffc8eb303ee29c1df3bdcf4501e0ab3bf3bc4fae8177088b9403b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 10852 bytes