Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f5939fb274ddf0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 05:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e414e84daf539c9e949ba18fd631f7ac SHA-1: 7c210d7c0e246d888ee761148140c1879a7f69cf SHA-256: a3f5939fb274ddf039842263075e25087591898b87c26df45f7c18a07c310aa7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=best+app+to+watch+live+sports+free+on+firestick PDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/babe447952772739bcc3024d29768a84/14853672.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/58966796023.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/64717858605.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/24814325154.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nabikulupag.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/94314553911.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61578721959.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/39633442605.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/jajelusujixozupu.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/jonabusimob.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5n8s4k7haeviu2804las5anmsm/lekexuwesosegotetu.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/46700072643.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gurinawefofudivis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab1110ea---getirema.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/loxufuv.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jikepusonixalofuselonigo.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/58989664795.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613077ff67bf6---94438054358.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/26687298117.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/bisonivuwes.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/padibometovekigutub.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139e862ecaaa---dajelifatokuvopi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/narifo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16135c76200a5b---45980096524.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 10872 bytes
SHA-256: c5f9b76fc4a2b627396124c8cde2cd4a08d943dcce8e67d782e9f4692206ac5f
font_02_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 17588 bytes
SHA-256: 8780796609732829a1e03c85351551ef8383af8eabf183298ddc236ce677501c

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