Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2fc8e1da2b8f98…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 03:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7038268d5cef2912fa329873ec8858f5 SHA-1: 9b9d0e8898e7f8f58c4390a604b9e48cc3511aaf SHA-256: 5f2fc8e1da2b8f9878f41d81c4c3278c99486a9e2bfb6bc1f61c200ea003a646
156 Risk Score

Malware Insights

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

The sample is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised CMS upload directories. The ML classifier also flagged it with high confidence. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161125103d6c3a---zukogogojogo.pdf In PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2fcfc3f92ac131d23eaeafed14e3df5e/palaxazuvozobupipixi.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/gulel.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/62436213587.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cf59b7b42fbe0dafd6ea32c8532def1f/rinukolaxuguxipazexux.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kewefigefenupufonidano.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/42998021434.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/74766300183.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/rotogewebomokadonik.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b462737c2da---38984330200.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2a37f086---81881038022.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/30ba59ec0c4e780551fcd69dd6c22544/dusunijoxisusawosasekeger.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd035578e4---65387125159.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/vokofosovefuziw.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/62518514175.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4163f26---dilaxexamu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/92799580727.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/2873128652.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/938368ccabe9d81723ef1ecfac220203/gupokojidava.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/11635999875.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/34090888383.pdfIn PDF document text
    • http://tencanpowder.com/d/files/78106307792.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/3d1c56f346b7df458acb8cdc549e87f7/45668148618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=week+no+calendar+2017+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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10684 bytes
SHA-256: 0c1c5221c6fa768d0862fb8c5d5b6c1d8a932bd778f559fe5b53e084a411c734
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 18092 bytes
SHA-256: 1d0e77bc366360d08d74040354dd43303ec699dd25d3eff35b17c1e46b6c0371

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