Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8792bd69483e1a3…

MALICIOUS

PDF

76.3 KB Created: 2021-09-25 13:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 013fb80c4723d1ba9c5d18d7769a889b SHA-1: 84a6b9b9b3f276addf2ae04b8d794fca71ab4d8c SHA-256: f8792bd69483e1a312b192ecdc9e4a06178ef3a7d8877ac61842d765f49757ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • 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://fleshlight-tw.com/userfiles/file/37403828440.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/57669838569.pdf
    • http://1night2day.com/ckupload/files/nosabagilamure.pdf
    • http://hbinpol.cz/media/images/upload/file/gazoxewi.pdf
    • http://everestlodgelukla.com/userfiles/file/11918139403.pdf
    • https://hanyauntuktesting.com/contents/files/9756054698.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/57277292428.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2968b724---45212673094.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xexirerevifetuvabozuso.pdf
    • http://mim2010.ru/userfiles/file/17252725209.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laven.pdf
    • http://stnicholasway.com/userfiles/file/60057395254.pdf
    • https://kohphanganhotelandtour.com/userfiles/file/47798110849.pdf
    • https://vientangluc.com/upload/files/pajesexetuv.pdf
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/pixotibuduxubomaxosapag.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/91928603222.pdf
    • http://zatuchlina.cz/upload/file/59439460338.pdf
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_6FFAAC820FC8A057.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/revokapekegaxini.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9858ec41c79bf9335fd1744fe38ede67/jefibe.pdf
    • http://aczelzalog.hu/tmp/nexapiponexawuwikos.pdf
    • http://koszyczarek.pl/userfiles/file/jologazomavovuwida.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/28717732934.pdf
    • http://trungtamsangloc.vn/uploads/ck_upload/files/ronazetimibowu.pdf
    • http://tianfonmm.com/d/files/79991587129.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8c2d5c7f---mafavodenegumudabok.pdf
    • https://canionglobal.com/FCKeditor/file/musadedufuk.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/diwafepivasoka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=unity+unable+to+install+additional+sdk+platform
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 16792 bytes
font_01_sfnt_off0000d3c1.bin
569726ef12d7764235d93b1f69041545401b5987b7f38f4875b2d6d271429c49
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 11112 bytes
font_02_sfnt_off0000ed7c.bin
c74454c004471b9ee8aea3a4783ca51b78882ef9b348a0103fbcec5b816cf8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 19716 bytes