Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b96bf28ab2aca8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 03:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 859ba6ad049636d3446220183cae42c7 SHA-1: 945b88c3b4488bb276741d3a28aefff19807d590 SHA-256: a5b96bf28ab2aca8d429be5d3389df9ac339cd777645a2939653c7324cda74e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics indicates an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=extreme+car+driving+racing+3d PDF link annotation
    • https://bakwanudang.com/contents/files/vitalidabebodulogol.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161392b053c73d---fuwalamedamifowe.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/najamiriwefekaxuzibo.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/72021061342.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/gobekufarebemajilef.pdfIn PDF document text
    • http://coumert.com/images/file/75909914243.pdfIn PDF document text
    • http://freewest.at/gubenix.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5addc556224d8ab690faeaf7663bee15/12721319447.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172052e450---kejuletilad.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613261be0197f---zakesomide.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/63114240062.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/81444606888.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/zumejas.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109121909105776.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/68849003979.pdfIn PDF document text
    • https://armenia4d.com/contents/files/68574118806.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/batezes.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/donuwedinimikenuw.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/14505439981.pdfIn PDF document text
    • https://sharenkon.com/files/79124016442.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/29465794680.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161305eb4764b8---demaromenabotobefunog.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/jofumedelegib.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qr3uj7srhgjv42t8kth67lov9q/dapitamav.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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 17024 bytes
SHA-256: 1622dce7ef49f199d5ac58d4e3bbd22093ead5d7e3c41e49aa9b796d4cdbd00f
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 10704 bytes
SHA-256: d68e00c595ef80f4f2ab673a74cf21d9b5ebcd421fc5d27f06293de6f52942c5

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