Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af0770faa519cb5…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 03:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d33b8b7e93af4a696df667abe26bfbfd SHA-1: 8d64f5f9fd736b8efb7de5702795c7c6c563077c SHA-256: 3af0770faa519cb5e8a22f3dd997b3fd510b9e4a6df4ed49a5ec9402ab76475b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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.
  • 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 https://kaowei.tw/image/files/20210913_164519.pdf In PDF document text
    • https://eminentland.com/admin/userfiles/files/13215391823.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/83708691372.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/98717057416.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/94801692648.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c7cc941c1937714b4b22887633c63778/venijoj.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f4d91f3f---tuboripaxebev.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/40355226091.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210911_9716BADF409B4879.pdfIn PDF document text
    • https://noventa.cz/media/files/file/39467593563.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903122230194.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/davexugawavimi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130404c754f2---xitexejarufobironawese.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/7789444395.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909020607_849927853.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/posolifotuwaxazuvuwawek.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/6484287577.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/kidimewomud.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/meruzel.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/20375044952.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210914135349.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/45793450359.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a41279ba5bc1bb81114802f23a043a01/pominiwoviz.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/30681961521.pdfIn PDF document text
    • https://shinaltd.ru/images/file/29105886967.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/41725548713.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901091335.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135b49107462---53546507410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=royal+iptv+apk+downloadPDF 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_off0000bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF0 10388 bytes
SHA-256: 2f85e2d6a91695f96ac0322f6a029eb206566b0ccb69c66a86351048105581ff
font_01_sfnt_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16964 bytes
SHA-256: b94f1561cac9fa43e2e33c88e5837a2264abe78450506562d7477e08da68ef8e

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