Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78e23b30c469614…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 18:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 970819e28b3fbe14521238df2d031859 SHA-1: eb6e364caebab4a1fc0eea7bc0d2bd1f1757cf2e SHA-256: d78e23b30c46961490febc6e63dddeaa2b849842478974014ad41e53722ac010
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, directing users to various external websites, many of which are hosted on compromised or disposable domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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
  • 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://huntic.ru/uplcv?utm_term=mappa+turistica+orvieto+pdf PDF link annotation
    • http://roocenter.ru/upload/file/97181541207.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/rosuzake.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/208211682.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/83418821912.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/dalorez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d628132ec3---talakexumada.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/wotepumijifitulosivol.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qg1g0t8l06486o2c2ulragutb0/50977673887.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/faxag.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/bizepixemenebajuxek.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/widamixikejamuzum.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/62995507389.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/bovuver.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/cedfd4e5509d7b961b03ed8f506ba9a4/51414923430.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/kubusudab.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a73f0d14---43013461481.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/turepasizofafanuv.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd33359f1f---vudanelupikagilo.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/ponisaw.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/29172243146.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/74796639276.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/gujurobofuluk.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161291fb742744---roxirezewebarirubo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b408a889f16---82304028328.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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 17824 bytes
SHA-256: c72a04c2da6e92102f94b59d628a409d188b7de75664cb2a19220f6a80661e50
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 10624 bytes
SHA-256: 493b542d701a81e5bbe7619f880178b4a673a6710bb636e4528e0fb7977e25b3

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