Malicious PDF — malware analysis report

Static analysis result for SHA-256 2735c194e515d196…

MALICIOUS

PDF

61.2 KB Created: 2021-09-12 07:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1281994311f3db422bc7139eeec457de SHA-1: fd72284f7fbc8350cd7a7d3f207e8170ff76308d SHA-256: 2735c194e515d1961eaf64d9661ea6df87f047861b24eb2d49d51d20aac3801e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to domains associated with compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

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://www.bufolari.com/public/immagini/file/lizukagadexaxevi.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136eedc7515b---xeranizalukitopaxis.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/88079580016.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/puvegurugeforimo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/53b40936a66bfcf0182f12ca64639a0d/23791823203.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/48432789176.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/58616256333.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/pagiludejomu.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/pabetaxupabiwubuxejiwog.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/ximabitofulara.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lojutadosiko.pdfIn PDF document text
    • https://alkoplast.rs/files/94185721925.pdfIn PDF document text
    • http://tyextractor.com/d/files/35548528052.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fa0e0cc1---45040315277.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/jariferegu.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/fakazeto.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/42652107613511fea147d.pdfIn PDF document text
    • http://herve-coiffure.ci/files/potetetezatumimojede.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/76974d5fe33e8e143a852681a9fab0f8/paposonuwik.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/78943284083.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/33768744587.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/pemereligodepetazukimagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+block+websites+on+android+phone+permanentlyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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