Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64a3ec4479382ac…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 09:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ab575b96d9f75dcba13dbc57d99f73d SHA-1: 7fca925a9fd8975aeccb198f91e0df8e28afecda SHA-256: e64a3ec4479382ac47ce04208e9569cffbac067a7f4a16c44ac6e50003321010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136878b9f10d---momokeg.pdf In PDF document text
    • http://phongthuydotho.vn/upload/files/wekemetijelijulebuwatubo.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/98783228457.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/74986597748.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/fulubilusefetaxa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e95cb4e2f---bomesisezojizizaxi.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59815933911.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/xitemivuzekejeseni.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbcd63a0f---82648244217.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/jifaseto.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/surotalaluladakuv.pdfIn PDF document text
    • http://medrea.ru/upload/files/12675582372.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908233401783364.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/kivixodobave.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109081147541014.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c1b8c5d---ganiluxazijenozowimasula.pdfIn PDF document text
    • https://alohasafaris.com/files/rafusigesezuwa.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161314e3d86db1---75574714619.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/wojipuput.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/73845533454.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/91522984088.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109132107488903.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/22345635829.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/35806539308.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/tabapapetibeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+background+of+a+photo+in+androidPDF 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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 17680 bytes
SHA-256: c8809f996ecd7bb2d37d701ced908d04d2433c1764cd5dce3d7a41ede2efbb67
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 11096 bytes
SHA-256: e09e9d3eee6eef4c16148bc0be8d6c706b0eb8a0479212575e7f344667e2dccb
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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