Malicious PDF — malware analysis report

Static analysis result for SHA-256 8baf9b1b84049b55…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 17:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db0146cadd07ac98f71ac7c9dac146d0 SHA-1: b5cfae7b50e28ec230f73a3d27d90a3044db6810 SHA-256: 8baf9b1b84049b5597cb8b2368510230bc1cafb0057db1e2420d66370f721de0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm used for malicious redirection. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the overall structure suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

Heuristics 6

  • 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.
  • 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://angkalaris.com/contents/files/nutigaluvobavo.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/253e6a71bd9abb685da1b1999fa6220c/sofupenusomu.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/87594970252.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/41076582611.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/2907751908.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/44189960489.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/87133870186.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135308e3a1dd---venumeriwufilivebaw.pdfIn PDF document text
    • http://yanartextil.com/firma/files/31476108765.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0719561c37f1bd3c6ab823573cd1815f/baxobun.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7f9d0cbf---wakasatekinuv.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bf518fd6---90444710320.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/82113622458.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/61945072138.pdfIn PDF document text
    • https://ibextrail.com/editor-images/febiroxepera.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/latezuwuxavaxemilimamufi.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/golozozilutosatenenewev.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1d2543a5---34156724679.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/jugigawitigu.pdfIn PDF document text
    • http://vucert.vn/uploads/files/91140133984.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091807461714.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/vareridujegexonuwevut.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/pifevogulanebu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/misurado.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109180544366176.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363a8a1ba9---23655397657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lost+ark+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 9920 bytes
SHA-256: 25dfad09917e2ab37cf042a5ed9b799214b6c893b3f49ec7b96c616d5c54db66
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 21280 bytes
SHA-256: 97b8e6a8166b0baf96b62febf92fa2a0fb7366695083ed0b0e61fa6f4c7cc7c6
font_03_sfnt_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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