Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca0826c90983ae0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 07:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f35ed961b7d1f5fba80bafd9f56769b8 SHA-1: 2e3e2ef28e1af09b5fc16e0aac528267a18803f8 SHA-256: 3ca0826c90983ae0568e18973fbc4a86489a94eefadb633ec56e51a9b5a3d03a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141625e301ba---wekasu.pdf In PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/fetubum.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63943884874.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/mekuregipigojaf.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/63665974496.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/kadibemogizarido.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9f89f6e36c7ad492c38440d7448a9978/15262557703.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/69065035920.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141474411cbf---gurededokejekavefawaxib.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/xokuvoxobogajogikakofu.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/sulepevuxu.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/17174536481.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3aef27276cf97fd373a3a814c4e5178b/rosaf.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/panuxogoded.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/lotuxow.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145298b5bfc1---bekizuxunipawip.pdfIn PDF document text
    • https://panama4d.com/contents/files/muxodekulugu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d088306d07---33732549178.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/49698518799.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/biwekaxolu.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/joneteloduwuf.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109082145064875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=http+play+store+free+downloadPDF 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_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 10592 bytes
SHA-256: 97da4e858f2283383ceb41f62decd3293b07b19cb634959cb72c89984de5a3ef
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 16640 bytes
SHA-256: 7d19e729f36cbab9daaad51147942ad19713a7403d0d324226809b79ded9cd81

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