Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfc103c3f8e4814…

MALICIOUS

PDF

87.7 KB Created: 2021-07-16 04:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93a27dd11b767b7190003d8665dd1d7b SHA-1: 2e039866847d6bf254c3c5e6780cbec234fc6367 SHA-256: 8bfc103c3f8e481406fe376bea089bf0307f58c3e39787cf2c23769fc71223b8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, indicating a likely phishing or malware distribution scheme. The presence of external URI links and compromised CMS upload links suggests the PDF is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://talk200.com/admin/admin/uploadfiles/file/62876217137.pdf In PDF document text
    • https://jotekonybakterium.hu/userfiles/files/53387735624.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nmf8se1isvq9tsfb4lsgq8urs2/77415890017.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/605d95bf04aeb8d16c3d5d24255a6f8d/39935161499.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/fejinazub.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d64c90e41---duvuwezubuloga.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xapodezosemuvopu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b293fa41147---fiwakududomofib.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210603_040515.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2753bff268b8d0511bbf57e813518da9/ginin.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-16/20210516064704567942.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/nuzufubaxirejoxo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dakiwevodero.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/4489774952.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/tasado.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lafamisegilanojobeza.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf4030577---negelemiditaligaz.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a2b9814c0---peziwopiwemu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpnstn3davsg33dnldceh6jf45/zaxofezamegabajuke.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/2766383573.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/uuip8ihoqokgok0nrobn4u6pck/69010623657.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088947023cca---41012802956.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/21969976141.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/66422819656.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/dadumenitodiremirafur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=evs+question+answer+class+5PDF 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_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10740 bytes
SHA-256: 1ba0e722cc08acc89f6a7e74120afdb9e618b1912711d1c273b271201b3eb7e0
font_01_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 16936 bytes
SHA-256: ead98ee056ed8cfa5686986ac02c3244ea2ed1a975c3e957181688bd59a4d408
font_02_sfnt_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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