Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79b1e3eaf3353a7…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 22:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8c26e35138e24e64d4e569854fe33cd SHA-1: 95d8ca01113af924531922983c704a47f9875a89 SHA-256: f79b1e3eaf3353a79d3db2073b1de629d6e25da0d60e80ebc77df7456f02c8bc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm indicate an attempt to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cmtsport.com/pliki/jerisivavumewanuxuto.pdf In PDF document text
    • http://hoangle.vn/uploads/userfiles/file/zalefipase.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/uvdtrkjlj2ojclnml5klnr98lp/rerixazegesozubadatawasex.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wogabewanovigowadimitolis.pdfIn PDF document text
    • https://coluer.ir/documents/file/nukijipomajomopotok.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a73e90d05---xaveruliza.pdfIn PDF document text
    • https://clove7.com/userfiles/file/difidepivowigepaname.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3253cd579---50173677136.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1ad7ce3b---pujotedurozufa.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216211349296217.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7a99244b---xabedoranukubawo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a730ccd138d---dubodidibisowu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073f14c38d1a---16485370544.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/bivuta.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/j57abv4eje35q5tohgn5rfh9bc/jafefunu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a4a7d148---62388861632.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/zufose.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/guwowuxafob.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/97222257483.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/40623877e80862fc9d60be606a8dc25b/jojewedin.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/talixevula.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/49825758614.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2786e20ed---dojoleremuxa.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/39164569296.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9c1b9016---maxid.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9519222c0---66731420302.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vajaliwemazov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+convert+excel+into+pdf+without+losing+formattingPDF 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_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 11412 bytes
SHA-256: 82b8bdd4239d6571ab8c2584c2bdf379ae308e5198f9d9de531648de51454542
font_02_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 17372 bytes
SHA-256: 7d6253db87287d828e2e0ba7ea182f258940234cb703ec409598781eda96d985

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