Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4dc980218754f1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 14:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 422c821e9de20d2c0cce18a13028828f SHA-1: 4ba6eb5520413adebf62b14e4094a926348e0fc4 SHA-256: bc4dc980218754f1a3de1cf7a3efba1070cd5bdf16cb9aa67e4193acc4902ffd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://abandassociates.com/ckfinder/userfiles/files/wogopesuguxatinuxivoferet.pdf In PDF document text
    • http://cesarrodarte.com/userfiles/file/38461043857.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/9651318903.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/af6c157cef09c36d0d20003d00bd9de7/muwurujizobenipelexatedu.pdfIn PDF document text
    • http://fygl.net/uploads/file/042018483229.pdfIn PDF document text
    • https://isosklo.cz/uploads/52855307609.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/80cbd57fa5c3546d759894ab5a5575ee/99712951596.pdfIn PDF document text
    • http://potlista.com/file/files/maguzupepanajegobanijid.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/xanovu.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/xunajoso.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/wedovisekovokusukasup.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70274e6f0---69680061203.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/busilukepitapejeva.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/96060197987.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/xaluwixafazimi.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/78210511797.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/jepezixawuz.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109090702422613.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/rogegulom.pdfIn PDF document text
    • http://cabini.it/userfiles/files/57118610588.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vatuwizumovaditedej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=teatv+live+tv+apkPDF link annotation
    • 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_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 17604 bytes
SHA-256: d89b5b7e17223d9a65928aa399c9dda58f067810e7be5f1ec859a45a36abd3ef
font_02_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 9872 bytes
SHA-256: c3bcbabe9bcf88fb5dfbc8be427b82fd30585cd1637484df818c85818447b0e5