Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6c4b56eaed8b2f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 20:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76e7fe6a7ca57976c578546c02315333 SHA-1: fbf11a5df635d709dde35eda6ad3a8d228e37ec8 SHA-256: dd6c4b56eaed8b2f0f12e0e3680b6ef09e8b37c1e8b36c321a462dbeccde15f4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an intent to lure users to potentially malicious sites. The document body is unreadable, but the PDF structure and URL analysis strongly indicate a phishing or malware distribution attempt.

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://nomylo.ru/uplcv?utm_term=non+defining+relative+clauses+exercises+online PDF link annotation
    • http://immobilieninvestors.de/userfiles/file/woketedobiwebugonapu.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/75383225665.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210912025909.pdfIn PDF document text
    • http://erdbau-rauch.at/dijapuboza.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e1ebf77acd38aedbc7fa74baabac4d86/dakixetikarefuzojeb.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/dusafevidipazelu.pdfIn PDF document text
    • https://kimcert.com/E/file/ribexidegasusonalilegekaf.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///74306259425.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/22016725337.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/kifidibaj.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/peluvufuxuved.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/nuzizidiregomagu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/48155468513.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/1235326232.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/32111001006.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/71680999573.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e438dda0be20ff98cdfd580d1a6fa768/balegoboketefet.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/vakuravodumigixe.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/rovaletutujit.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/zuxari.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b52cb57620c6d8fd852a51b5936a92b8/punolurarije.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5c47f52ef8f983f851732aadc7be284a/nakukexe.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/madotuz.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/labufozadepodipuzukew.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_off0000bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 18040 bytes
SHA-256: cde417ed1392d037af17757f68b8ded2f24815b5097a3737dcd23df419b641c1
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 10896 bytes
SHA-256: f68e5e22e5221c2bd62ace0dc3b5c97a72a6506f62865ac57e75c52a7847d7f3
font_02_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1