Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c36e97b23dd82a3…

MALICIOUS

PDF

76.0 KB Created: 2021-09-12 14:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f364ef5c282de749f0927b636080ce66 SHA-1: 26a2d7520c53cc2105bc3a09b8d3c311e4324447 SHA-256: 6c36e97b23dd82a351ebdd0e52de8e1692c8a317ca391c047d5df752f8e0cc2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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
  • 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://asiapharma.la/files/files/91412437792.pdf In PDF document text
    • http://devison-matras.com/upload/file/57170543715.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1dca709d---bodazekagavebazaduxani.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/maguwagofefelu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/5387461921.pdfIn PDF document text
    • http://abwessex.com/uploads/files/68048526932.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/15102371165.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/fepaludedabuj.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/nuxikezujijum.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/gikeraketi.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/sonidupaza.pdfIn PDF document text
    • https://businesslife.com/content/files/44558764419.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/9096785027.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/xekovosesinezixudovomapu.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/63190319339.pdfIn PDF document text
    • http://eternaseguros.net/files/files/kotikupifu.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/ruvalupatezuzabux.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d90c973a80---75739792881.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/7717656789.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/maronupunagidonitebakapi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494bc1267c---duwuli.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/54050843927.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/77537434774.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161328d1a33c4a---mevusamenudufagunemasiz.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/fipojujefepefaworume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=calibrare+batteria+android+senza+rootPDF link annotation
    • https://lapdonline.org/file/rogotelijukutarev.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_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 17508 bytes
SHA-256: 47f40d38a075a7abb88cfaf7d462327522b1735b43ed50a292f4adb2118bad43
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10472 bytes
SHA-256: c99e99bb0f49299c0e533521d7579683727f89b28d0d75e9981e3e6d54cad83b
font_02_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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