Malicious PDF — malware analysis report

Static analysis result for SHA-256 520f7cb2c75b9143…

MALICIOUS

PDF

82.2 KB Created: 2021-06-29 14:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e3e314caa600ebe7d29a24b1a079c35 SHA-1: b90d2ce6b1f930761fb157f9bc1d9de74a7f6094 SHA-256: 520f7cb2c75b9143d2c713dba88aca38a2d099c8cc307d106a0fc4c75977ed9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cristal-in.fr/userfiles/file/makumojugovijedu.pdf
    • https://papiratisk.cz/soubory/wukogeguzaj.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082de09a585f---83792850468.pdf
    • https://kopari.hu/files/file/39766459063.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7b6e964a7a9f4db7ceb30164bb2a9cbb/misiguvoja.pdf
    • https://rybczewice.pl/userfiles/file/fetati.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc650069ea8---tenidev.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/h4dpflljndfqcqqgk9mn7poj84/nifivotozazo.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/iul11o1qd5s8b7063j96o7b4bh/13083823812.pdf
    • http://abwmarlboropike.com/uploads/files/jaxegitifer.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/0c4d4edac8b778fc217487535f5cff82/mebewadojamakunotexe.pdf
    • http://dlevitin.ru/fck_editor_files/files/kadidope.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ff0bd17a---60130282837.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e8c77d94df753fd21b774e57093f514f/varebadexadegakezirimaret.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607975f92ddb0---73250400768.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d434d8d747a---46293553776.pdf
    • https://all-new-wow.com/upload/files/72292339014.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbde9abf62---27696582138.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b5dd93a638f7c2288930cd2059dd84ce/bozesav.pdf
    • https://fanaf.com/article_ressources/file/27371635829.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6836e69704e94cfcc0995c0af1e824d9/50190382620.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4035691ab---67974762386.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/99668149747.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cf668e813a03ad4dbe491deeb4f3e5d6/xatugujalimajiwenojo.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804135ad759---55117456899.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fractionated+stereotactic+radiosurgery
    • 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_off0000dd66.bin
1fa52e2a45ec16a4712317c60a55bc603282fa7c34d0acdd0c656043b1027545
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10692 bytes
font_01_sfnt_off0000f5e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 16792 bytes
font_02_sfnt_off00010df4.bin
0c602525bdceae53784ce8fab955fc95d023b2cfc834d084de9a255ec9f8b923
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 17332 bytes