Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb91aa4d60436b93…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 20:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5b6e299f5d245ea987c7a50ac67754f SHA-1: 75842dd28630c16498aa5c74bb80d4ef294cd6d4 SHA-256: bb91aa4d60436b93619d1359c39c2eeab31251aa16325ca60e76554b92492bf8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kirakuramenandsushi.com/uploads/files/ninamazetalapuvepepi.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d24bf7d7---17506663689.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d534a3b6200e05d81534d25bbd6882b4/fogurusorapegut.pdfIn PDF document text
    • http://kaies.net/upfiles/210726092036170717jrkjb0.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9kcguqit0ts7tdj5aqm8gqh4v7/92673904072.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/wudufud.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/em054rc7sfvu5so5d0s9rvrpu6/67901544952.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/50131910253.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fe6b4e6d42a6a8884bce9f7db89e6228/52877604935.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/5169445177.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a98feb1387dc2d4d8f03403945ce2b00/79497505094.pdfIn PDF document text
    • https://fishuntpesca.it/file/27542647852.pdfIn PDF document text
    • https://armenia4d.com/contents/files/monide.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/29532376861.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3a874daa23fd7d7ba0a906a4737eb3a4/kadovijepokudoduk.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8535b6157cacf556dfa4f545cf0d5e10/wapujogudemi.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/wofudonexemok.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9d03a2b2a---14522495998.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/zetig.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9590b39a4b995ba6ccb08b480fda5b94/6860906610.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fumuzexixezidaxemovoj.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/37909527815.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fad254bb6556764f2c79696f8d3b7495/kutavifuweb.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/81766029467.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d648c51917---zivakoketi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=osi+model+protocols+pdfPDF 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_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 10540 bytes
SHA-256: fd14bf311130e2c82dc45144efaf8b3db422a59ecc2216fe3f70a1c2938e3fe3
font_02_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 17040 bytes
SHA-256: b25a271accac02e73cfb9553154d5736d2a9fd264f6569d62d544066aa503c52

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