Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad66da052ad2fe0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 20:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ca8e62d042b72b9322828f9acf81434 SHA-1: e4b3b0e2550e294fa45aae5ad8dbf8041522d427 SHA-256: dad66da052ad2fe01bdcecf2a6aa1bba7ad53d229d1e0b946a1aca962052e952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/55786146058.pdf In PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/wufajijenuzofubiwiromax.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/30998382966.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/69642755737.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zinelomonifoxi.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/rominafabixogej.pdfIn PDF document text
    • http://c-amc.com/upload/files/74001244325.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/73350667100.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/rubalubajurosa.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/59138127704.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a205647c9269c5fd987d1cb2d609b567/39152903261.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/zezimozamizutobag.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/69218923445.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/gatixobopamavibimig.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/60322258214.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/32525364021.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109050701092668.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/6104180282.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f321c506bd---kenenigivixisadaved.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/maporilefekewawes.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/noxoporofa.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381190b876---somuveso.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/kudepabuzajudu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/93099940465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=release+date+for+after+we+fellPDF 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_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 10280 bytes
SHA-256: 42d536fc908c27848f31b92973822f01298a358057434db991a693b4c65eacf1
font_02_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 17296 bytes
SHA-256: 83b178b3b2ce73dfc7ec7944b7896a9991b17c33b2086b333d47619b804e1b80

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