Malicious PDF — malware analysis report

Static analysis result for SHA-256 0037bda55db9b101…

MALICIOUS

PDF

65.1 KB Created: 2021-10-01 04:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9aaf1de75419362f864104ccecf957cd SHA-1: d21c99bc65f8cfdd68abf72ecd13a01f8f85fc26 SHA-256: 0037bda55db9b101cc7e764eea4d62bb086c5b17e21b65def8ccc15e5c96deb7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5922

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 https://chcial.ru/uplcv?utm_term=%C5%9Bci%C4%85ganie+z+youtube+na+androida PDF link annotation
    • http://ptaki.info/imgekoprojekty/files/42650859310.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139da77465f5---8151160102.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/16800124023.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0494223c---41131181134.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/90969879844.pdfIn PDF document text
    • https://salonrewards.ca/images/file/60914310055.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/depovapijim.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/89229347540.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/kajiwafabezebamot.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/femugun.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/87511019147.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/kejajalukaseje.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/wufafomijotumutidinogana.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/faxapeterixadimepaw.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210925_86933CA57B2CAC62.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/sunalujodigarejej.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/wasomogakubosawelovo.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/18534170726.pdfIn PDF document text
    • https://5udua.com/contents/files/buxuwedigizorewepidiro.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/26868424753.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615435a485803---lofesejipa.pdfIn PDF document text
    • https://fishuntpesca.it/file/safidakedasoturase.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/83462956646.pdfIn PDF document text
    • http://northamericaminingexpo.mininglifeonline.net/file/19Y7zPqP1V9QGhTj.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3bc8b9215340db99d63c0ba3b2922f38/62063887778.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/47754292420.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 11076 bytes
SHA-256: 5c3fa586328df01568c7ae433b830fc757443930a7175b71c358e749c8e24a6a
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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