Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c64c3d5d1aa364…

MALICIOUS

PDF

79.9 KB Created: 2021-10-06 07:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 50801766e7a31b95a59b80cc37e98d09 SHA-1: 2a4bd07ebfbb8afc0c730b0e4adad2a96f5f3e96 SHA-256: b3c64c3d5d1aa364e2a21bee763623fab271a4edba9c2c2666117214686ec7b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised websites and potentially malicious PDFs. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=government+pdf+textbook', suggest a phishing or malware distribution lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the malicious intent.

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://crysiq.ru/uplcv?utm_term=government+pdf+textbook PDF link annotation
    • http://etenindex.nl/images/uploads/zanusoxefiwariledo.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/50687156984.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/93495808673.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/buforufiserasobudatuto.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/verijefazebejodenulita.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/77524477491.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/gazetalik.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109052304581980.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/36971915138.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613456beedb9f---pafakod.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/58002207037.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161387c2be5d90---36834106633.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/najamezomes.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/turivegopileva.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/juvalofukutupugugidun.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614101f73721b---14159379807.pdfIn PDF document text
    • http://labotinnghia.com/img/files/42952820632.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/60766211250.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396f0fae6af---darabevuzavip.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/91106008668.pdfIn PDF document text
    • http://worldtrip-eng.total-flame.com/application/views/blog/userfiles/file/99471378884.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614369768a8dd---jimufifulivuzoxusojanizak.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210909_031424.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_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 18516 bytes
SHA-256: 8b0d3e585f735df034f94ef888c5ec06db4fb730eceaa16b5e3a7c30ea8f17f0
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10632 bytes
SHA-256: a0cfb13d8c186be54356a2b047b632f5fdc9770ee78bbe2da504919dc3c0ae34

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