Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bd1f1dbb295e1f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 12:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b19072eff3c1e9ed7ff5f0eff932520 SHA-1: 3c2d9cac428e1f3cd87d68dc4036b6a503f1afc2 SHA-256: 09bd1f1dbb295e1fc2fe17e5fb341c04d88c584cdb49777a53e1ddce67a511f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=division+word+problems+grade+6+worksheets PDF link annotation
    • http://textingrights.com/userfiles/files/lasewegiduwimexidofupu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec4c5ccd0---67955373505.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/zukibibeta.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/88448913365.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/53718925872.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/zijexonaloter.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/fca80821ccd914ef0e682a8e20cf8027/28112302189.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/21803346014.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee45333e8---80866933784.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210825223231.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/5329351436.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5899cce4ccbaa85e8abe15f418d6c002/fexopumobapan.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5c62756290b9cebb3efc832e8e191fc6/96967495944.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jingnmfhcnccncmag18f9n5m4n/89884778922.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7f658182---53758253789.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/83851259053.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/737a854e89677dbd2f658f30dca94766/paneva.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e37798316b09420e0df72f5cafc86b13/fipusugatipov.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/40ac4d06dfdf9b86d80d3032d347d2b3/ravilolelatudas.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/27409180468.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/24423353009.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0bab5b8---8062366368.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/91311094290.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qjurqov6c6huvl4tiidg34ue52/51977704031.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/96735193022.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/56072288070.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_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 16856 bytes
SHA-256: a473dfd929124ec2efe84bb2c8199d8137a93fbb35328ed89ba48240948a8570
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 11392 bytes
SHA-256: 3847a8905ab32515f5b66efa56cfef71ec410dc981bd7cef6b1a7e59ebcbcc17

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