Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bede87b715d5697…

MALICIOUS

PDF

88.9 KB Created: 2021-09-22 11:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4dac84699da1033822b602aaa1203484 SHA-1: 66ffe19eb70561225e437adc13c28470d1c14980 SHA-256: 9bede87b715d5697a4f931962f9c5cbbeb9eccbbe6de1378ec3e30f6733a3356
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is unreadable, but the heuristics and URLs suggest a malicious redirection or content hosting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=linda+goodman+numerology+book+pdf PDF link annotation
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/raturelu.pdfIn PDF document text
    • https://themalc.org/files/file/pitibanofal.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/wekiwarogefanezerivutala.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/nevikejizawizusususig.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e95f1b12---namofipajagikagojijek.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/kozatadumalajokizakabu.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivaza.pdfIn PDF document text
    • http://dobermanncz.eu/files/55525077010.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2uap3qabm83t9g7lhfp7jdfe1i/gedanirafijunumenagako.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/49021253388.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8151a127---63445767011.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/32327545568.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/81463680413.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/losedijufemivegabam.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140224b5a0ab---81631945172.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc61e1e9b---joxewufunilum.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424646af3ab---vevebanigeso.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de88384f2c---82749613384.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/28998877838.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/80366621625.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/30107148872.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/90211768731.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/tular.pdfIn PDF document text
    • 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_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 10976 bytes
SHA-256: 9163d8e07277455727318b68712a71c568a9d5257f2efcacfe5fe0be3f8986bb
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 18284 bytes
SHA-256: 803c99d535da47d520c4593f7365c65e418d94b196877b44d19d4dbaa479d459