Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffafeea6b6c8da9…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 17:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c45e70860d578dc796e1a6598e9d56d SHA-1: 0ccbc255f4fc0aeba0da0307c7dc989cf3e5b7ae SHA-256: 9ffafeea6b6c8da96906271f47dfb2c194e8eccf06b630b484b63d2aada64df1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL findings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9dbf2c34---38018477705.pdf
    • http://divorce-difficile.fr/userfiles/file/vuderexawazisired.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cf668e813a03ad4dbe491deeb4f3e5d6/xatugujalimajiwenojo.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82868515593.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3b20ffd2---kanivajinapovawopulu.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0d20ef93---4230036695.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2f29cd0a457a46155141231882afad65/risijiwakaki.pdf
    • http://sunarfactory.com/userfiles/files/28610280452.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d89574730---90914704947.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/fd4926cbe8c290ada9d070c80c81f0c2/85468157573.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/vabusowan.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/uomhfheuu05km4nn5df8m8h337/nufibug.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9c7be9cb---47111922525.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/32l124uiju4huub8md239vj790/domujebizekexupatu.pdf
    • http://agcslohian.com/userfiles/file/penozumanefijev.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7qu19tas0hjv9nolm7olgnici3/3499495038.pdf
    • https://isleo.com/i_photos/file/78429710124.pdf
    • http://driver-jazda.pl/upload/file/77434855841.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bce83c12c22---82893892958.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c006b40c38a---34703386406.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2077c60d9f---fibuzebufitederivuz.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b6981085---75147352467.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cleaning+fee+apartment+move+out
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb4.bin
6eba32b697867fc7b1a4e3fbabf7e62fb14a42288587b64c24df0c305a14cab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 17328 bytes
font_01_sfnt_off00011c1a.bin
8bd4030963acf31cd2840645010488fc61b59c47e1cc51ef9df6778739ec40d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 10728 bytes
font_02_sfnt_off000134c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 16792 bytes
font_03_sfnt_off00014cd2.bin
14ac9249dc330de0a0e77ecc328c5da5534eabfa8e0665d5de17c8eed677ad8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD2 1860 bytes

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