Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76db6ee5e8601f1…

MALICIOUS

PDF

244.2 KB Created: 2021-08-14 01:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 085dc7415a38393d2c04b205f1b69f01 SHA-1: e25ed92d9ff75abca8d428c5ef3d3b8d87c7fe64 SHA-256: f76db6ee5e8601f1171b76a9a62bb241df01407479b7bcb2e8494345ce15f7de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious content or download further payloads. The primary attack pattern involves luring users through a malicious document, likely delivered via spearphishing, to compromised sites that host additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9593

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.
  • 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://cokhibaosang.com/media/ftp/file/70472237139.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9bb23e8e6---15481793307.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2cc56e31bd20d7f0e1439b0a56aabe56/26207184987.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba291394ba1---jibesolirosibagidiwow.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/wenifowegal.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c409b6521---dasikexuwuva.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/bazekotesogamasirem.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/35812425021.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/44082944725.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/nezumugi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3fccc218---90734957287.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b640a0be949---52733986666.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/b4u4rs6jd201k64fh3ev583e31/61924347997.pdfIn PDF document text
    • http://sushi-belovo.ru/files/81131155043.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/1689659865.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/21926601029.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e3360546---34011506215.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/18168376415.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/s852m3umhqsgujjt67pupd7k7s/zilotopibiwotage.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/31960498732.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bfbaadef735355fe09d4c55274007ff8/kegapesebelefodujopak.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b0292d3ef5086ffabad28791ead5b51/25672158836.pdfIn PDF document text
    • https://hoongnau.com/upload/files/34569124451.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/refalurikexaxizujefumovo.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/62426322838.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210718_A6EC79BF9C972241.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a16a348d---bajegakuvijoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=japanese+ceramic+artists+signaturesPDF 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_off00035265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00036a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36A72 3640 bytes
SHA-256: b06dc449b97f57c974ab8191730c109c099dec1ab3ab11aaa5594f70e36ef264
font_02_sfnt_off00037891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37891 18080 bytes
SHA-256: 867e0f918847a476bbfd95a6869f48549ca8ecc9ac0e4529f388d5c32e83bb6e
font_03_sfnt_off0003a760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A760 10640 bytes
SHA-256: 00ae3f8ef3e64be360f0c060545f6172da28d1b2034ea27507651dde6080fdc2

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