Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac58e2e253406ce…

MALICIOUS

PDF

93.2 KB Created: 2021-07-01 12:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c0a9b27cf71401e2608a5c25f3231e1 SHA-1: c1e9420cd4fed3c0c4fde5b4e13dbe982018c0f4 SHA-256: 5ac58e2e253406cece24f99bb52cd635cd94c979ffc5a0f4184a3052bdbf2c2c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ec3786ea---nekeju.pdf
    • http://goodwill.as/userfiles/file/zupamusutezunewum.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/up166fukc8isaqpbap5ujhforn/poneju.pdf
    • http://ascensionchina.com/userfiles/file/96992770497.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/59881646959.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160904c8f0aefa---romiluzutogigijox.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f21183a5---26370521199.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbdda691a---64983254768.pdf
    • https://sharjahcements.com/images/bulk_images/files/gevosakupofosuraf.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8e861368---xizidudiwefodeva.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f79b47c7---xidajutuwulasetobeb.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/b4rp0q1j70tga3i9gvdefo290m/51971316820.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5aa45f1dfe275151bdc7980d7bb3989b/gazekeritugufudatudago.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e2c83449f0708ca61b3cb8a6052c551b/25008560062.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a755021b779---13607502075.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/bb88fe8cf0cf21d6cc959c58e387a2d8/vewumenurodumunaza.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aebca5ce572---selusomuraxupimafav.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd58c1c1c---86174787540.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/88a47a0e897fefe733a846bbde928b2d/40980167012.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/xufusafiralus.pdf
    • http://hanleyresources.com/images/885806220.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesufupupovu.pdf
    • https://kristinanamaste.eu/files/kuwosimumumarobemese.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/82278577089.pdf
    • http://habitat3.eu/userfiles/files/90053192700.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/67b296e5895e37957f58ef14e1b3b114/3928582998.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+the+mandalorian+online+free
    • 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_off00010a4f.bin
07bde6f163c1703a55664e996a708f29efd6d2948ce833d9a13dcdb55e71fca4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 17328 bytes
font_01_sfnt_off00013776.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13776 16792 bytes
font_02_sfnt_off00014f8d.bin
5eeac99047ae3f6f13a32ef41244a992d87d02f1afec14e03f3b84d5d7e0da80
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8D 10568 bytes