Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3f14850aadd02f…

MALICIOUS

PDF

92.1 KB Created: 2021-09-03 00:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 334456a678340e5979526b31a6040418 SHA-1: 2038f269c5aa88a294959528e634923cdb78c0da SHA-256: 0b3f14850aadd02f88875dc014ad45089a691a4d3c6766472a413cd1051aba4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings point to exploitation and redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://motiv8workout.com/up/files/89342292131.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/dba5e1487caa181f7f30a2f8345697d6/tidakaruduxejonotuzef.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/n9b0lihvt7ct5jtdti5hp356nm/ridigoluliw.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f56d064c6da---19824369460.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/nfbqdq8c84hq4l6flj4dlijmn3/zemujozikeg.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/suwibir.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2b1a298a998321aa513c45fc7f5efed1/12066644039.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8f80319042fb7bf7a60c49ef53ffc4b3/xatasupanizemifujo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/29543730877.pdfIn PDF document text
    • http://derma-dts.de/files/file/47597176577.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b75081b06fdf60d51b4037af3e9de1e8/71006078054.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o383cm0v7kha5hpfte17pntsig/92795089723.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/27863667908.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/94b84d68637a8b73f7bbbb4284d5cd1e/wagerun.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/neloxanedenozetexu.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/fotinaxopiti.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/79174846268.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/13420265760.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/rozifa.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/16959791155.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/xefelawosizarewuwerod.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607684a6d41d4---16528854083.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/goxarifipate.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/33369203332.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/rakanilepagenileku.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/sonimewodimuwuxuliva.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/81b815c2fa3eacb01d258a7930f3028b/38360998290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=history+of+dharmasastra+vol+4+pdfPDF 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_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 17604 bytes
SHA-256: 13373b0199f6d7ff026182905a8ad3ccdc12b8e53b366c1c421bfb6dd581d5a0
font_01_sfnt_off00013330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 10776 bytes
SHA-256: 3d5980400c69d12b09ec3b3d2023720c9b9fcbf4e3edb1bda4ace9c0e2681618
font_02_sfnt_off00014c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1