Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6e51e402a16cce…

MALICIOUS

PDF

99.6 KB Created: 2021-09-02 14:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 78ed29e849cd98d9b7a2dc49ad6fdac7 SHA-1: 5d47fc74550d3aa0a97443cf958d235dd95e63a5 SHA-256: 8a6e51e402a16cce1566bc376a594ba599e83e82462e2f2cd6803ffa6662815b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, several of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://arcomproltd.com/userfiles/file/kirug.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f6eb7dade8a061bdc2b56dfa9f7849be/muzuje.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/dovasulew.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/luvikanorekunadefi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/75246256993.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/vujevewugubotezeruxo.pdfIn PDF document text
    • http://beiks.info/public/file/99528921734.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4d9b9de00---gijuxurodufa.pdfIn PDF document text
    • https://faprosid.com/file/melegubib.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/62224081060.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/zipotigol.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16125ed5c4c695---26427380009.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/64q24khdpo4o1atvp0ksbsvkh0/45306608580.pdfIn PDF document text
    • https://alutat.com/data/file/43507646724.pdfIn PDF document text
    • http://ned.ru/uploads/files/86861731960.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc5dc0a6d---losizada.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/71579180958.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/2299005776.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070117463073499.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/17124753472.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8514de3f---1695778974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=1999+mercedes+ml430+repair+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 16160 bytes
SHA-256: 0de48d09b0091e2dcca1524f119562a2650f4f0070c1ddb91a42211a810a88bd
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 11052 bytes
SHA-256: f902908dc28b53bb6d0a9cb0a7a46020e1cb9e847c7f5471a65188e3821c369c
font_03_sfnt_off000141b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B6 25104 bytes
SHA-256: 8f1b4c2a8c96f785d5f60f49251f818e618a5595ea908861eea9cabb06e5d19a

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