Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4115757e6306ef…

MALICIOUS

PDF

91.2 KB Created: 2021-07-05 15:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff05ce5b81b5bfcfb34aa612f465113a SHA-1: d4af9017b551ceb6bba113a87a497c150e5823c2 SHA-256: 7b4115757e6306efdbd5e8f101d5a59b6765ac4e2e82b2cb81a65fb930fa3420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate the document's primary purpose is to lead users to malicious external content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=coneflower+the+forest PDF link annotation
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_44B4FE6AF32342F0.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608131e97e8be---likiwupenez.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/3683852568.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d291946799c---27642269063.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25cf29156---34557450534.pdfIn PDF document text
    • http://alltechsro.cz/files/simigopu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b6e2a27ab8c87a0899841c7e3a8767b1/25396239776.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cf24c956---91175571002.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/51133789445.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97efd953eb---mafesexegivotopujatulofe.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/18182121487.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7b9b206d---rudisugidexat.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16074f820c03da---98670297790.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823dc81d615---gufaratigunaxajefenune.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/kekoz.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210605092949.pdfIn PDF document text
    • http://rc-modeller.se/images/file///sugakowelel.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/7889658156.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/92128111950.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2d375a29---68809389772.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb98715c8a---zitidunure.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c9442b50---57131883361.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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 10172 bytes
SHA-256: f5e2892792346d35351deef682f019bf7ca9b47984ab992bf10cc5c4ad043ab3
font_01_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 17432 bytes
SHA-256: 1944fddbe03b29353abb1fd40611026c5be91c0d8091f065916733c9a28deffe
font_02_sfnt_off00014795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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