Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dac93ccf846d55…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 06:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bf79c3398bdef81e5b2ad005fc97fe6 SHA-1: 25843a5fc4d102d6c451fe3b8254b1cf196c02b4 SHA-256: c9dac93ccf846d552257e9e150372329b62a6ba3273178f4b14561cfe1ddad89
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for SEO poisoning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the heuristic firings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://liveisagenix.com/ckfinder/userfiles/files/xegalekafabakonosuguja.pdf In PDF document text
    • http://alacarte-grafik.de/userfiles/file/41772067733.pdfIn PDF document text
    • http://atomleasing.ru/media/File/zoraji.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/37115560737.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4815acdb4---losudidilixebokur.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/11453574407.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/797d82c7145895f08e318edbed51fe32/49667499287.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/ziwoxutisiramudufimavenuv.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/74281534989.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/63927732021.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/74446209747.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/noxisisofenibopowore.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3aedfeaa687df1ddfb0dd30a22e16728/simefek.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qol88hb9cmd9ga63vh7lthlrbr/6075188814.pdfIn PDF document text
    • https://grnca.org/img/files/files/sezawulerisusap.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gusuxukidipipofamagijab.pdfIn macro / runtime command snippet
    • http://selispin.com/calisma2/files/uploads/58644086435.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/wajakugoriwalabisevom.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161345c6b31bf6---dugafumafo.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/92731930155.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/92101215592.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ff40147f9518fd98da0fff6059f9f643/gazojevewo.pdfIn PDF document text
    • https://grnca.org/img/fileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+body+keeps+the+score+pdf+free+downloadPDF 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_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 11020 bytes
SHA-256: 8a5addf4db147774d1f11ee427bd77d4b037fd3d05af7d54a287837acfbaf1c4
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 17776 bytes
SHA-256: 7ffa9936645a462b2631e18e59d9584cb8ee4d42f0701a4060c84e74c133d20f

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