Malicious PDF — malware analysis report

Static analysis result for SHA-256 886bbda0b17fe4bc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 11:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be9cc233f5222b0c5ebbae70979bfc78 SHA-1: 5f34af4c68ad04b8fa7dbd430be12c350a844d38 SHA-256: 886bbda0b17fe4bc9ae4bb1e231378b84235997e647e7348019cd6cfb7f6b705
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ud2-140.com/files/6096083813.pdf In PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/tonabarefu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148e52e37800---mibutumokejubaluluvebapu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pejuvuwiv.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/dewazikin.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/f3an0ba4ngdin3h0ld43htao48/jibarekuropezuvujepedem.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nejovine.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/73a951c1fbbd1e8335c764712c77fadf/lanuzokop.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/samiriwivovelil.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jagizebodixizil.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/ropesogadib.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/98961336037.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/tuvole.pdfIn PDF document text
    • https://lazerom.pro/media/file/71070969863.pdfIn PDF document text
    • http://ux-school.ru/files/files/dujobugakafedawogibom.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/50650784472.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/82365014697.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/29219864298.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3162b6d3---tanojemisivixiponu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70379684977.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/kerotifaj.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/70877107249.pdfIn PDF document text
    • http://actinq.nl/upload/file/tipexefitujowu.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/58366649965.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d1e88442---77321320328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=winning+eleven+12+apkPDF 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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 17364 bytes
SHA-256: afdc3e6b9148806058fde1deda7fdffa72e3ef7b799ccb2a0a329a359d6f8ecb
font_01_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 10264 bytes
SHA-256: c679e08fab02086d4807c179f5abdb67f32d1791ca6f7a52a064265b1a8e83d9

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