Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21017e3b45d15f7…

MALICIOUS

PDF

89.2 KB Created: 2021-08-14 21:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 26d2019009050686a32d1613ddcb92a6 SHA-1: b40ff2379102454139aca52e4ee5864a5f61562d SHA-256: e21017e3b45d15f7726f2e590b460d2c165cd618efcc9a1a2622fe605bd9bcbe
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 the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://s8radziejowice-paszkow.pl/userfiles/file/22662087465.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c37156c0c7038762b694a833107dfb4f/31056863080.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/j3cj4vh0ep7vsm2ss16sr1n46d/2355940007.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076156042a70---65151152461.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/8265959379.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085de81d44c1---71523858766.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/36912558391.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5311001c---54138612318.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2671d7b2de---vamoziruzosajekekafus.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/gesojifutomejip.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/45516827550.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/25291944351.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/pajazewamaxomawi.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/petigisiwosil.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uh41k1iudu10lhq0vrq0vv53dg/dexegorinenakev.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/35260099518.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/pujajiwixegizarenivar.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/wutuxokafa.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee24d8ae2b---37465061012.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9fb9691d---fomosamipepofuwavigedopi.pdfIn PDF document text
    • https://fallsplat.se/file/34930246333.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fepapijejubekikufovozilug.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fbife89oogriahqq0ptaoke1u4/75299706623.pdfIn PDF document text
    • http://nature-revive.org/files/file/39316515726.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/zonumukafirazuposunosude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+are+the+military+ranks+in+order+from+highest+to+lowestPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 11088 bytes
SHA-256: d898412815a052ee87b36346447bc21930d563baeda8a76b30c716a6d4959f8b
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 17320 bytes
SHA-256: ebbca559be6266df3fcd3a2a6bec9ccd45d79d5ef972ed9b566f21a8f1b33b06
font_02_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1