Malicious PDF — malware analysis report

Static analysis result for SHA-256 24660091e29dc2f8…

MALICIOUS

PDF

72.6 KB Created: 2021-10-07 09:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4bdf099c5093434cf4dafd8ec4494b8f SHA-1: 2a8c28ff90ce6023216fa67503a4a8b09ca9dd26 SHA-256: 24660091e29dc2f81bffc915e25e5bef09efa251335f6222d4d80777f6f9635e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://sahodayabbsr.com/test/fckeditor/file/jerejuratofa.pdf In PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/82692425154.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/wubomokilu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/10296128601.pdfIn PDF document text
    • http://briztravel.com/upload/files/dujos.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/83782002941.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/14988476942.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/tivetetoxasisup.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/10345456426.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/48591111634.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/33606386652.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/39105041471.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/2034707901.pdfIn PDF document text
    • http://zl369.net/userfiles/file/56479011907.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/42854671776.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/88515956315.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/13221505390.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/pofarejijikokotevedidaro.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c48fe7eb70cead3d9835e302fedea5b8/bivejum.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e95c7de67---88196757299.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zupevomiwirutimokika.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/79507946102.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/sufupeletutosa.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2dtko54p6fj41ugse4dctsnlfm/92095391726.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/wavamejasupuxofizax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=area+code+for+fort+lauderdale+floridaPDF 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_off0000b996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB996 10280 bytes
SHA-256: e641a7527d2fa03d6d36706e718025e497ab08f4084c1b46a5b7b665c81bd824
font_01_sfnt_off0000d0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 16952 bytes
SHA-256: da25477084ddc059d1962fddc233d0c1950d927254aac659d80423e7d115cd0f
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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