Malicious PDF — malware analysis report

Static analysis result for SHA-256 955b9f264529ac8f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 00:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cac4c573f364d3fd6a866fe3cfb1d08 SHA-1: ee68f7a3de5703409fb43ffe88b48a575a3caeb3 SHA-256: 955b9f264529ac8f2fc4d5b28efa5d8032b4956f5a269605481b138d23461f9b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://foundryindia.org/userfiles/file/85383808687.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1a16a5a7---nowazunerojugokuxidi.pdfIn PDF document text
    • https://senfina.top/uploads/files/65312299141.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/17132732845.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096aeb3ba821---firototamar.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608081ad19187---31237908021.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/58858264535.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/13d032d40bc068f73b1ef78ea614b106/jesitiwitolikebego.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b2d390ec---33045736806.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/42383471778.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f94598d2---nutepixa.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dajijasavukagexazaz.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a192760fba139dd75bd16b44627e0284/93449668220.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f2a2ecca---babexemofiz.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/87941421632.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/87212314268.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16272937464166.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/rabububidu.pdfIn PDF document text
    • https://mmszke.hu/files/file/xabupapox.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/547b695aabda09eef7085f675e4d533a/lemifikikidulukadutopojef.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d362446e714---doxogawa.pdfIn PDF document text
    • https://blv.by/upload/editor/files/63538888834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tratado+completo+de+magnetismo+animal+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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 10928 bytes
SHA-256: d6a8dc03079d599cba977b77d3ea7014f527eca64c8816510aa5c6e0fb868517
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 20176 bytes
SHA-256: 39bc5b06484ff54a771f9c2f663a981fb1955f4e2f51a7d1bdc361e10fb59d90

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