Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b1e2fadf578af4…

MALICIOUS

PDF

101.8 KB Created: 2021-08-17 11:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 315ad4b5faa55b45e28b1f8caa0e349e SHA-1: ccdd998935a929153279425e50c779dddde22a7c SHA-256: c1b1e2fadf578af4a7667bc1068bd9e9c0792e65743954ac47564234328f90e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=numeros+mayas+del+1+al+10000+completos+en+orden
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d770e73c7b1bd875ec601217733a6e58/91984613677.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4dcd0b5bde4e44888cca4bffcac600fb/jebixuxepaxo.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/85743870299.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/monadepusapavoz.pdf
    • https://z87992961.com/upload/files/20210709103802.pdf
    • http://homenet-spb.ru/userfiles/file/55995148569.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e77258bf65e---59020333700.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6587764640.pdf
    • https://datatech-int.com/userfiles/file/74791272953.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/rarovuwoki.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e37817ec316aae941a39ff897e04c2c7/12038849591.pdf
    • http://grhs1983.com/clients/72571/File/zajafotozapuze.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160fef5dd41c0d---vogobivefejibini.pdf
    • https://balaji-technology.com/userfiles/file/bikix.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/rovunuwadojatodem.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080158226274---femiwiwogi.pdf
    • http://garderoba.sk/images/_file/tilaxagejukumuxafatagam.pdf
    • http://udemadriatic.com/userfiles/files/jadopotirepetikula.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1da30ea29ff988741b29aee41033713a/30534203434.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/67d7663c2a5bb6ea7728e5251e57eb72/42960071080.pdf
    • https://anthonygillant.com/userfiles/file/13348973724.pdf
    • https://systematix.pl/userfiles/file/dudekusapamebupava.pdf
    • http://vistobrasil.net/uploads/file/jifuza.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/550169601a43c0e393dbd55a14187225/24236780892.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3f4c9bd0f6b422c370a661a5b8784db1/rozoxexitem.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/h0i66i65rs42gjp5l11vdqval5/nojorovek.pdf
    • 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_off0000ffc9.bin
ee86bc6f9e3ed9fc19a5d7e6b634c08d10ab536e1b0266f67ec0c7e8c1b9f649
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 19212 bytes
font_01_sfnt_off00013117.bin
73cfd9dd0bda9429255d8baac9758ce9a3c133f3b1268528cd9e9f69fd42a599
pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 10948 bytes
font_02_sfnt_off00014a88.bin
5eb27b92934673b23000fde81e9fa7b5e6ff135b3d11240fa25c0b700eeb86de
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A88 21376 bytes
font_03_sfnt_off00016f29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F29 16792 bytes