Malicious PDF — malware analysis report

Static analysis result for SHA-256 f579d0c9214deb13…

MALICIOUS

PDF

88.6 KB Created: 2021-07-27 05:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97462f2904507ba7ef7b2630b7860632 SHA-1: e28c1f4072cb3f5599308fc2ec663d598a5bcdd7 SHA-256: f579d0c9214deb131d5bbd89d56c9753e146acac7579d58b19e1d167ef8851e1
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, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://arniestribu.com/campannas/file/39007989320.pdf In PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/99511179168.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa648d034d9---volot.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3ghono7c2pcdbmt0hfg98j00kc/57065909958.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609858c80757d---vojaxakokofezinajuzifetos.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/jakone.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/51465908782.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/vobifufokugipumogoworuz.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/mozalipedaxibimujawudivuz.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/61822477268.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ce9e84c---65238115406.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/niserajotamorur.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5lkog3etqv0nl67cj9oavhp6b1/venudetevutorobok.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jtknscjabhb707ou2bhhuss2mk/pudimesaferegumakevos.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/91302c0ff9b1c6dc20d7fdacf0fb061c/4675301297.pdfIn PDF document text
    • https://renault-service.com/userfiles/74959905540.pdfIn PDF document text
    • https://f-kcc.jp/user_data/userfiles/files/11768309696.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/87930898451.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e4aa8814---96475283191.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/btg70iujkkin8r8bhs5riqor20/38067422285.pdfIn PDF document text
    • http://bociany.sk/media/file/54970032826.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/difibibeb.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b647acac45d---60039680207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=determination+of+iodine+value+of+fats+and+oils+lab+reportPDF 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_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 19012 bytes
SHA-256: 2a4f3ac193902d1cf987aa3f2c074cb882f957df555167dea4bae0eff17c3180
font_01_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 10964 bytes
SHA-256: 2613726c3477b5a08018d057437400a18338ee5e60d2bb021a5cc0b2fbdf0763

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