Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa1493131baf8c4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 22:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e433e17addddd908cbeb0055047d379 SHA-1: e0dc832336cd3aaa44bd9191b6297d14eed59353 SHA-256: daa1493131baf8c44a85c6828d74b954b65d3040d94be91c3180913377877029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories and other unknown hosts, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tinhdauvietnam.vn/upload/files/55294276879.pdf In PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/vaxowabomapipubinomefaga.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/56409808378.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/gesomaxegemiposapazube.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/bunanozufosenuxo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613059fe5d744---66059229086.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91ce0b19e---pejozowiludibafu.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/betobofaki.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cff1a34d082b2113b748997772cb8a62/84136627091.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5ca06c81---65393702619.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/wodofagof.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/68637788361.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/87106686878.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105a54e83b---65780280339.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/44243276595.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/74379166455.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630963131.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/nujobesot.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0669227d---37596127569.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/47219250735.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091115294838.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/jawewusepatifujidovug.pdfIn PDF document text
    • http://web5gstore.com/Files/files/fapevufisonurejufebuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+free+tv+apkPDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 10476 bytes
SHA-256: 143323f0091c5b7254b01e85fdd100bf0bad6685fcb2cba41dff6f75724d75c8
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 18244 bytes
SHA-256: 75d8e294686bfa946cc8718b8093a68ded107762af2eee4ceab9c6868fa6e99b

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