Malicious PDF — malware analysis report

Static analysis result for SHA-256 3442614129bb9b61…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 00:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85fd6832075fb83a7feaf953b2380e18 SHA-1: 25d56a251da1fefa3b8b4defaa96dd479339ff73 SHA-256: 3442614129bb9b6173e13757eebf5532d7626c8628ac7875b6bced9819176019
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links and the 'utm_term' parameter suggest an attempt to drive traffic to malicious content.

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://eastmangroupllc.net/ckfinder/userfiles/files/tenukomagamadosig.pdf In PDF document text
    • http://precisao.org/files/files/dowupukitamoliweledubepe.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xusexowagowe.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/91225829806.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132140e5cd45---bovofogomenewa.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xoxesisivew.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/51155472853.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/35929806196.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/musexi.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/xabozijopetulapuwijasol.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/devularepetirewofamizapi.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909201514.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370b0951b8d---82201391118.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/wokijolakiminowore.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631261336.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/27009504505.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/kotubujedibita.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/81748498742.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/kfvk273pghfputge6vvgkctup1/golozu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/32003245984.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161326af413619---segaro.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/89384470008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=app+download+apk+for+pcPDF 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_off0000c1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 16748 bytes
SHA-256: 84d657a0cabe4de4e623a0e2e7915d35207e6eae243af85e4a7a832937f8d3cf
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10284 bytes
SHA-256: 39f263d8f4d9118f503a9202bb85ee3125b5b95cbc8a06b40214f68c9c642d7b