Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75b25117267d4f6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 08:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 893532c2e91ede4c1055358ca2dcdc71 SHA-1: 23e2e9a8fda507d3c14a34dc5f9463e0e7275f8b SHA-256: a75b25117267d4f649fc70dda7584512abbac9748c4de19070ec88561db840f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140be44af78e---83396818285.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e705c569c---33838857573.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210904_77844A33A10A7696.pdf
    • http://vititanon.com/user_img/files/pugutegoxanoronedibinama.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341406bf8e8---91594213069.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5a66ab26a5c5e625064ecdd6bb8b7a3f/dejolunoreka.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e2c222ca32ddc94ba870927b08d5c1a9/tadudivapokov.pdf
    • http://solarwindependence.com/ckfinder/userfiles/files/xugarigobofepidunidaso.pdf
    • https://preprodpcb.com/userfiles/files/46289388519.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/47163133565.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/majapugefipas.pdf
    • https://chungangroup.com/uploads/files/202109062226153407.pdf
    • https://pellevah.com/upload/files/52667344397.pdf
    • https://sanruouvang.net/images/uploaded/file/37592731511.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/suzakesij.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/22282769378.pdf
    • http://olympicthesportshop.in/uploads/fejinanegirusobu.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d92009aeaa---bejazut.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/92208382409.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/rekibuxorupulaviv.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/79341683478.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/29043015156.pdf
    • https://mentormedya.com/files/rovavodo.pdf
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/ruwexeb.pdf
    • http://senvietsystem.com/ckeditor/upload/files/59251164714.pdf
    • http://arniestribu.com/campannas/file/49557312432.pdf
    • http://auxerretv.com/content/public/file/guvimifoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+backup+from+android+phone+to+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e251.bin
5c17f49de74857b0e655a41dca47e158232575c9404284b1963a5f280b5e1b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 11080 bytes
font_01_sfnt_off0000fbbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 16792 bytes
font_02_sfnt_off000113cd.bin
804157c50a0361c59fa196a2bf9df268ef84ce08ff92cf99ee5e2576985d77cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 17260 bytes