Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e66345cc3ef051e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-04 17:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0936041b684f84da055019b34042eb79 SHA-1: cfd681e5308226c49799b2c49449eb0bd6ea289e SHA-256: 4e66345cc3ef051e15c5c04265ebb547679158c24a3ad7d7bd0b946a5bea8273
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://aplusadvance.com/naver_editor/data/file/fozuxiwunoxigotudetoleg.pdf In PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/nikixi.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolanudujerolu.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/25096693690.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/jamomanoxamomuniboxuxiga.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0bdc75a1a---natebesop.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/uilas0g39innn3f5fq9ddjb910/24314081748.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/metelarowidipuvijoson.pdfIn PDF document text
    • http://midel.me/userfiles/file/nunugobenajasijefedivi.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/78471863382.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/vilidumazujamapedudemuj.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/gavovevebiwona.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/fezafupevotoresepapuvedob.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fozamis.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6i7cct2td886hq6rs8i3p2t8u0/66875923843.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/vagoruzuxugivawopepubi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90110454693.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/47993086854.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/4752453276.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-27/20210727145030179507.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/viwepufaziwubelisulaz.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/dafuzudole.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zorox.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609892d2457ca---totatixozox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ab+asanas+pdf+free+downloadPDF link annotation
    • https://app.asana.com/api/1.0/usIn PDF document text
    • 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_off0000b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 13952 bytes
SHA-256: fae7b47cc6cb51ccb43ddfe16f45a9bb20b5f8338e5670f01a2b6bb741675e25
font_02_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10508 bytes
SHA-256: ea3f6819af3c467613b10df18b3b1875fb119274e87fc6676fa5de42153ff52d

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