Malicious PDF — malware analysis report

Static analysis result for SHA-256 5425605de3953538…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 16:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9308625bc78180f0782d25b914e9aab3 SHA-1: 9b99702ce42d26e9c290d06c66b7365869b00c2f SHA-256: 5425605de395353878fe83d57ee1b27ca3a26996f0e72e1af07c3e2ddfdbf5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://chcial.ru/uplcv?utm_term=farming+simulator+16+android+1 PDF link annotation
    • http://www.masozilina.sk/ckfinder/userfiles/files/9976172046.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0672435cb---kizufaxiboral.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/38929296917.pdfIn PDF document text
    • http://prograsifkalip.com/files/85890309588.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/3927989555.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/48359038730.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/96358425412.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/5856874414.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902115904806574.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/vemiwidinoru.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gefekupuneso.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613114048937e---kilixesebepagesifivire.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4dfd8e1e---vokozulix.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee8798b50---dekofuniwazinugak.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/58667818530.pdfIn PDF document text
    • https://trainova.com/userfiles/file/jilusimu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vegodivelagesijinufajemat.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/46761695891.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/99158195532.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7a0afb4c75f85790b66f52147cd6d1c8/dulitewewexifazurazozil.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/xumelutedakujopegav.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/88562852159.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h91rqpb0ieqvqj8i04tu6p6a1h/79251466177.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b8022fa4---50240074460.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/bupixudufuzukajexujef.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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10756 bytes
SHA-256: e6c11282d5687636454cbf27ec653593cc91cf0c563940377028c8f61005f276
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 17332 bytes
SHA-256: 3b26ee29315796ac58744105790610d2ee01fb64998414782cf95b24da146141
font_02_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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