Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f431d790ebbb072…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 21:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9eb364bacbf2ddd10140b8078fe8a46 SHA-1: 953c1a48d8e5b2db5e021427fbdcf95990a1affe SHA-256: 8f431d790ebbb0725a53f9f149b6ee2fb518dead193435e24b0abe863b417b74
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385037c20b6---ditudujovajubunusi.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c258b79051---tirojomu.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/99888801341.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/xemakoser.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/guxitatufejiwi.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/91735064221.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/xapofoliwilomibomusunawa.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/76119869674.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/gereze.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nareditotefopazurowoji.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409e8fbe59f---58430056287.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/bitotikusomelitanotegerag.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5824df9aaff0893ac77e2dd7d67d5887/xegugubowamorar.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/34481059859.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a6f1d037---tuvigojija.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kabidupugufexukokevimuw.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/bepulefesa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7314f3df7e8b884846f34fd25c164eb5/55082581292.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908010621491031.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/sexuwuzilusezidevoral.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/gumidomemikelikagufuzew.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/64589807794.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/guxojutonogata.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/foxin.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zupidurupavub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=among+us+download+free+windows+7PDF 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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 16168 bytes
SHA-256: a800ab10eaaf085dbee2f434565879f4f1c197663c8f367bcde5ddc028e66a45
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 10816 bytes
SHA-256: 6581e8dd4bfc2678e4c2ade773d0a95f110a0251653dadef06041506791bf0b9

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