Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c06d9a781796c53…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 09:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edae7dad6b0a290d9decd8aea52e2b5a SHA-1: 34a0a9bbd4c36bdec96798e10f3a78f82a42282d SHA-256: 8c06d9a781796c53fcc7166f6b5dbc4a0bda01c82239f0106527e3b863fad2b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://vandervalk.reviews/app/webroot/files/userfiles/files/21281895571.pdf In PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/gagilunevogijujebag.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5ca96c78---zetulimabaripiko.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/65154009498.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/zobigupine.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7f444582---nikokelagibepidefaj.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090416100752.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/64483344551.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/89632046041.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/lisali.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/xixutudi.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/19989018837.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/sases.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/sajap.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/eb15f8d8d7888210af1346625ec4ff7e/78780012474.pdfIn PDF document text
    • http://bankerz.in/qpic/files/80570311680.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad841d1fa9---23312993114.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/budebovizugeguze.pdfIn PDF document text
    • http://air-con.ru/upload/files/53965608236.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/51045144921.pdfIn PDF document text
    • https://blv.by/upload/editor/files/69440250972.pdfIn PDF document text
    • http://sissonne.hu/editor_up/favawuxupasutakabawif.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/golewigetizolunut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=is+spinach+good+for+low+ironPDF 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_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 17628 bytes
SHA-256: 98c8aebf83b36d6de1ab5811f742c083aa934ec8ee26614ca94c55eb2c9c6e46
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 10704 bytes
SHA-256: 9f733d479989ae419d66420e40b0326826ce30bfad1d848c96606b861104d03a
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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