Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4acabcf7816427c…

MALICIOUS

PDF

75.2 KB Created: 2021-08-07 08:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c33f2e1494bc84a03be429769936043f SHA-1: 118e7b3b8f2b14e7c0f0e6b62217798021ac3afa SHA-256: a4acabcf7816427cefc36269dd2e742847e602326f7acdfe024a682a65ee176e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6299

Heuristics 5

  • 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
  • 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://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sodojivefowefuzedokug.pdf In PDF document text
    • https://mahae.hu/files/files/gekavagewatazetopefeza.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/napado.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3de838661dd5d2db174b4581bb875494/natevorukijunegugul.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/69494151034.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a225215d---36127671416.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/59366974392.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/88603753480.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/67181000332.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/85491705645.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/8617078890.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/da1e26742281655a3e8744da8e6ed840/47323952243.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/xowatilunudafiwesawugin.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/voevslccop7g3p2h2lbmibakaf/jepojebojuzutiwenolot.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee252552e3a---26482581831.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/xuwirubajebar.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/kinilivokajasegavare.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/bexevuxe.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/49854522826.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db8dece3579---92779192106.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/86572039181.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6fcfc7819acfe0172d0b01f7b6990ebf/virak.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xunixoxutoponanipawezobo.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/98275478308.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/34344875897.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5b772ba7d---59112488146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+read+a+tractor+serial+numberPDF link annotation
    • 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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 10848 bytes
SHA-256: f741136012afdeb35b676a7483c3fa9989c1f4ea4c054f182d867ed30a7c14fa
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16456 bytes
SHA-256: f1d37c1d156b7a7b93d6578046163ea392841c076566d0393186608722b93a3b
font_02_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1