Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d5565ae0ae590a…

MALICIOUS

PDF

85.0 KB Created: 2021-08-23 22:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2534edf0916077b7b36d3095ec432960 SHA-1: b2ff7c8d236813262b4fb9bf2454bae2181a9b3b SHA-256: f6d5565ae0ae590a5b052558e874253f220f80ef1aa742ec4b08ec7543c8f905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pescepiana.eu/userfiles/files/nifusezebugobe.pdf In PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fujabuso.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f240b92617a---furasenanakege.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/61431416465.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e55d20f50---77558885329.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/wurel.pdfIn PDF document text
    • http://hotstamping.pl/files/file/56408958553.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/25700903990.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/fovidofixinoj.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/4358289779.pdfIn PDF document text
    • http://starsunited.at/upload/files/87217806978.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/90443327694.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1009f31ccb42c5883972bf03d1234b1/nuwarutujajuvez.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079ded20d181---62794653424.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/sugev.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/besabofezefudew.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081181ea7404---dajatixorizakisigisifig.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/tivebupasapuxamezenosot.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c16768fd6---sozurukulizoxo.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/disakimuzolawapotuwusupi.pdfIn PDF document text
    • http://machin.kr/userData/board/file/53319940013.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qp2pffj06erb8kqoiivvm438b4/sonamuwugizeduposo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/0r886vsqsngoq61828oiva1g0p/23988461971.pdfIn PDF document text
    • http://abpaluso.com/upload/file/notolanadojoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=system+of+linear+equations+elimination+calculatorPDF 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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 17252 bytes
SHA-256: 50b16068c2f2396471e7505a9a7ab35adb5c92d1c19620d2e9d9a396e4126858
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 10932 bytes
SHA-256: db52d5d83801681e78ea83a0b28fc72cc550c4fe11d963ff09a672deeff6dc73

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