Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfecdbd1457f72d5…

MALICIOUS

PDF

74.0 KB Created: 2021-09-12 00:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c76fb7739f24be45ad4ca29f67331ea SHA-1: 3b4b876a1b8d3bd28fea8c22faef8c81aa8ce03f SHA-256: cfecdbd1457f72d5e4f9ea580a616b100d93a1cfec58a5cd6aae854755430604
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.meditech.cz/ckfinder/userfiles/files/xadubomujoxugifegodevuke.pdf In PDF document text
    • http://dissanna.com/temp/fckeditor/file/patusago.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a96bb30373.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/37993693772.pdfIn PDF document text
    • http://poultech.net/d/files/vuzavetukojinarepagixov.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/60282608458.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/13770947533.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134256e87abd---28561281588.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/37408885379.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/48672213493.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/siredakamokevi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce557b0af---gasisudiwawo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a8e48f79---mowenilap.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/52777145094.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/kakokexegotawijinazid.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/tomoxexokelasoninu.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/54111304851.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_29B67C09B9347228.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/terojokijitorogulotip.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/repitelekedufirikosukam.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337044ecd22---vukadinojamiwuzix.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/vogopuwajiwi.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/33979571559.pdfIn PDF document text
    • http://synphabase.ch/upload/file/68009851489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=composite+numbers+1+to+50PDF 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_off0000bd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 10784 bytes
SHA-256: 71d75c2477ea06a3ee229c0f662f26e7725963da15be374427eb3a9a6708d081
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 17104 bytes
SHA-256: 8a8f33c5095a7e1104e29c6806b712a6bf19f1bc8eef9376e8597d8f67beb276

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