Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec6e539593bc5a7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 10:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a3ab9f64e9d234bbad64ad210edee17 SHA-1: 7786dc1131290f89463148dd929465a485f743a4 SHA-256: 3ec6e539593bc5a7eda08557eaf3ddb7612cabb3580d2ca3eac44b0e143e918e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple unknown URLs, some hosted on compromised WordPress sites. The document also contains instructions to disable security software, indicating a malicious intent to evade detection and facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaad534cf---45532242344.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5ec5e1f---xilaworiva.pdfIn PDF document text
    • http://dsraxys.com/uploads/51567174007.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/tulogisowifixer.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/gixukerubuf.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/17030587728.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/27955640965.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf855a1ea---92073849524.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/sepenulevuwaf.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/92632002444.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16549301546.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904054850.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/senigawexuxabaga.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/40493550668.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/79399214315.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/bajufagukaxumibaxe.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/39422988825.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f5386a77---mutujebebiguromimurale.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/vetigoxabuse.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/latin.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/mesaza.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161333746521c6---37983244417.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/85476844134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mortal+kombat+komplete+edition+android+apk+downloadPDF 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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 10696 bytes
SHA-256: 0bcc17e999a5dd40d3e3360bf563e6994bf38b4d9eb9d7b43af456799530eef3
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 18684 bytes
SHA-256: 1c924281a8c216581e896720489b23676923226b132520794b8bf3c7c34ddc0e
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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