Malicious PDF — malware analysis report

Static analysis result for SHA-256 94745adf778ed583…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 09:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c8e3fa8e99b7d849aa43446cd4a0fe5 SHA-1: 708a52cfe865b3856f1ba261ebe5a6fa608b0733 SHA-256: 94745adf778ed583588ef06d00e0f048e6765430a280fdcb7aa08063499f30fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and the nature of the URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://marathon-gexin.com/Uploadfiles/files/wozexe.pdf In PDF document text
    • http://grawerlik.pl/userfiles/file/75388722863.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63309e2ef---dukubixiwun.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fbfe80072---dumoxadejuji.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/30075892543.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/42364983683.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/27543661227.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/fugobuxesitadive.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4g19ao67vk0t1phuboq41meu65/dapakefawulojewav.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be183f48a68---sivenevilumitoximedeto.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4cf723fad---25334767504.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/2303968501.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161056b92334af---99138094636.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/45855831101.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zixufikadekumopusadobopur.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ef4258430e5fe1e9218be42e257405d6/29586827695.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/24132326154.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/99794455419.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0d1262d9af50449cfc4141029b0c04d6/vojedisubugesobewi.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/87668187924.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/54761592400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ausencia+de+conducta+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_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 18160 bytes
SHA-256: be37cb0c72e75bd7d7f8d181c3d615296ed733160447022616ba0415fc5195f5
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10548 bytes
SHA-256: 2ee7ce3def9b94121e1b6dd0412f706edbc9d88f394a8982401156153e816199
font_02_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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