Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9365029cda00679…

MALICIOUS

PDF

67.8 KB Created: 2021-09-11 16:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45a421ba6363aa138f8e2b7c8a16b25a SHA-1: 16aefae72299226755d4ca480713c66c12b18670 SHA-256: c9365029cda00679f09f85f71dfa576533ff459d932e33c3da18ee4ec9dee486
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users through these compromised sites, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a93dd097---47601056616.pdf In PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911852464542.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3d68d551a1b5e6c36acf4d7eebcfc005/nigixalojatareditokalajax.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/97739298107.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109051702594714.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/14981257436.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/tobeti.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1oj1uj5f7gbi19rq9uigb16s6e/fozexajepurodubikiv.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f6401b3f---zubituvixajadesowakojof.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/67806191809.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/xujukafufewolipatozovogu.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/kowonojijotajojoxujifawo.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/77866063897.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/64699037481.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e8546875---nurixadobepes.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7rlhe1c5iasu25334nef3620hi/37872444546.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/mufoximav.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780e4daa85---77905934921.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/59043268587.pdfIn PDF document text
    • https://0900107678.com/upload/file/fuzunimivemu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135888a8496d---88681944281.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fabuguwojumonozevogobuv.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/68873179699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=desire+movie+2011PDF 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_off0000af8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79D 14248 bytes
SHA-256: 1265007db7237d279992fb661b7fac39b0a184e7a6e0c19d2ac731c5c6e56c49
font_02_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 10220 bytes
SHA-256: 91ddbccd8497631411533b134f8140f7c4c81846c100b035e1f4604ef8d0bc90

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