Malicious PDF — malware analysis report

Static analysis result for SHA-256 25445a4f8782a552…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 21:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccc478dfdead4993a9174a9585d66c85 SHA-1: 0cb7ad2a9f36f55301f0e4f7b8580d9d28549985 SHA-256: 25445a4f8782a552f3863c8e32db66d3875caf7475b0e09cc9461f5d14b899d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings reinforces this, indicating the document's primary purpose is to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bruceleevideos.org/images/file/81425649646.pdf In PDF document text
    • https://perfecthospital.org/FCKeditor/file/65775290887.pdfIn PDF document text
    • http://melvin.cz/data/kobetipotusanup.pdfIn PDF document text
    • https://amgaa.org/temp/files/86171145915.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vavetejugejesokudox.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vimubonakal.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6209bcee---40653386494.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/salipawapewoxagel.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99d4c71e3b145982c93aa4ecff2ae12f/35396119134.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/mefejixikojebomomezovod.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/paninelubimanusejasakepuw.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/7331266753.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tbd6bdvu98m0qv7d6qop4t866i/debafekosobovosotadi.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/49692515858.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/xetupobunolilofivim.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/09/wewofi.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/zagaxolewobuwenakedanos.pdfIn PDF document text
    • http://sarlampa.ru/In PDF document text
    • http://lsneotek.com/ckupload/files/84580554627.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selasexabax.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/71134809169.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/vozefipowaluvawek.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449551bc6f6---93575745723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=telugu+palaka+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_off0000b18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18C 15072 bytes
SHA-256: 22e4fecaac0a7441542b5ad443c4f696f9e2fde2a2be8b4ca274edb535d7212a
font_01_sfnt_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 9900 bytes
SHA-256: 4650eded9d59c7385f70b5a9ad51ef060fcaf39486a19f21a75b0d642775f887
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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