Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df5d4c48a0132dc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 23:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e4b1a87e8418cefaa1da85d7bb8ebc4 SHA-1: 2e093a25e451edf79e7ff2133e21e918935a7a29 SHA-256: 6df5d4c48a0132dcd633284a956e1327be2cac28de11976c8ce099df1e7bb384
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to various domains, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=alien+shooter+sigma+mod+apk PDF link annotation
    • http://maschimaurizio.it/userfiles/files/56615747394.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/93865223510.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/wutibapiji.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vigadipefekomakinexiteb.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/fipadegugatimip.pdfIn PDF document text
    • http://360global.ca/userfiles/file/5936830525.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/67663998662.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/lawumixuzazak.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/56936267850.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134167e98f04---99878089970.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/razuduviwusasizitoz.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109111528454063.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338287d094f---18027285673.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/86255952383.pdfIn PDF document text
    • http://deforma.it/userfiles/files/88675539010.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210903122946.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/wuvon.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/37571852312.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05257f632---86492787026.pdfIn PDF document text
    • http://getvisa.ru/images/File/miwudedadizabekujetup.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/16251263397.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/52225269036.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210901231705.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/6160658503.pdfIn PDF document text
    • 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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10912 bytes
SHA-256: 41e71d3c519f348bb74610c9b0a7d519a0294a7225165a305c86455bdc432b54
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 17092 bytes
SHA-256: fdfeaa1a6fee9f2f2511ef624c25b7796556ee69a793f01c40ed47abe904b215

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