Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9763123523db275…

MALICIOUS

PDF

75.2 KB Created: 2021-07-20 08:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0b7e7ac18227417fe0fe1fa7b092f82 SHA-1: 480c28a4cc84509b29791a2d6898700e1ce404ed SHA-256: d9763123523db275d754387c41a7ca7621fcaa2fc0a2b17f573ccae96b303c1f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to various PDF files hosted on disposable domains, a common tactic for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is intended to trick the user into downloading a password-protected archive, likely to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://csc0535.com/userfiles/file/20210703181220_nr6syr.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/pebarexa.pdfIn PDF document text
    • https://tdfstore.it/file/39345214855.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/zimilowolanuxivizuzikilam.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ebb42cafb225bbe12725065e0da83bc5/juxaneru.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/ruvigukilamoxisifonos.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/javepevuvilezalavumutuv.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91995a18ca---pujilibevotug.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4p2kfehvksfmf9euipht02s396/tixoka.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/zemimikofenir.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d3ba13f9---77062730724.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/gupijazap.pdfIn PDF document text
    • http://accronline.com/userfiles/file/taronefibezozo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/56084630189.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/81d8540dfe95ad246ad0ca6cdf2e1d66/96751071395.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cd9251e94---22123768930.pdfIn PDF document text
    • https://wagaskar.com/media/23695298886.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e79b5e9a2ea---moserixinolojuvurekumaro.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b56b2393---kiburemibawofonalita.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/zexujewamexebufekin.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/96834280294.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/98956530096.pdfIn PDF document text
    • http://novichiha.ru/pic/file/suxiditixowumosonezijimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=converting+locked+pdf+to+wordPDF 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_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 16132 bytes
SHA-256: 843b084e45cd4f213fc15722c481a96b331efa983dbcf15c38b8a04532c6218a
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10740 bytes
SHA-256: 85dc5e18c0eafd85b1854e0c6452f90116286f5900844f9d873feece540e32c3

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