Malicious PDF — malware analysis report

Static analysis result for SHA-256 8866a2da777b823e…

MALICIOUS

PDF

91.2 KB Created: 2021-07-30 20:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 11923de6b7fd3a43a3e1c68be958e4d9 SHA-1: ac9da2b15587496948882f753ee9cd553b1ad481 SHA-256: 8866a2da777b823ec271f7e5e5c7e9f4c6547c28fe3955e76568cb5254804665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://urduhadith.org/survey/userfiles/files/14224066711.pdf In PDF document text
    • http://haumeaonline.com/userfiles/file/20853638410.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944af95bcec---fokudupibupabixazozafexa.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8139eea8e4ee6ce54c6933202abef7c3/robonilelifuresubedi.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d52d44593---43831012606.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/sorepubeb.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/71251555afcf880bd6e42f4baada20de/12568987804.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/futenunejaramupesiwitezap.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jpi44ft2gdap410cp01ueb0q15/rodawo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0dc6138885db6c99c0cae7eb95a1c175/46814341513.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5b82c02157562f21f7489500cc06bddc/17956461881.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/42490909767.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/jagugesogameburek.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/82509528753.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/83662195402.pdfIn PDF document text
    • http://servmed.net/userfiles/file/rumer.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccf242828---26559578823.pdfIn PDF document text
    • http://c-six.it/userfiles/files/80105151470.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca808690a3---xotaparuzopupej.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lolexikidevepujokilej.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f7db90d6d---43228077374.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/sozexukobivonopitamomimir.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/20492973156.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c7378169---tafajiraraka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=flocabulary+text+structure+quiz+answer+keyPDF 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_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 11040 bytes
SHA-256: e98c4314610bf6585f087b7c6588b4796d798841013890ddebdcca4425a7afb7
font_01_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 17760 bytes
SHA-256: db410eb423ab41631ca928abd13c902cb3a19014398ab21466e9782528cd95b5
font_02_sfnt_off00014459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1