Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e97cde87f1e685…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 11:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9278d3aa3c8b81e9b2186e85103cd664 SHA-1: efb8bf1f0e237aea84af0e46832e2c6fbf3632c2 SHA-256: 76e97cde87f1e6859f27af8fcf8a038a6104cb24bb2fc996709e6891d0b6cfb3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, often using UTM parameters for tracking. This pattern suggests an attempt to distribute further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=2005+harley+davidson+sportster+1200+custom+owners+manual PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b314c345e79---tiboxibekotidu.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/47220463810.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/safonasofolojugokesis.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdd4f8af9f---50323357651.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/64599504692.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/04941b68e6982a4d0d79190c970643e8/rojevob.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/84128556969.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cf730c8d5---62442416462.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/42482553364.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/66607747428.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/11d42cb5bbdb53543a4ccc28acd84dd5/98475079050.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ea2d236a---fojusawokamugatelapuxixoj.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609919126d85b---nabijebexomolulumemurozi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6740245521.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/fukeb.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd340d541e---piletirug.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a3e2de446---nexiletazoloxejoxuxubix.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/741899232.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611258c2bc0b5---63652931747.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44f312822---35494762907.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f25d7bc17a5---patowimofatilevilirezumed.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/nudovamudod.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/68833019855.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/57894448312.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_off0000bc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 15888 bytes
SHA-256: 738e38a3bf1543edce9d69e7070b39f5bb5b0d3ac11132e392e68c1a5eee7919
font_02_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 11476 bytes
SHA-256: 5ef4b3fc89b6e41d0b61513222481297b8b9cfb3f931d0fd2e45e7aadc57ac2d

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