Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea1bf556ff2c909…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 09:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e518058ad6bce291adf7a2d3d3945678 SHA-1: 57f3781ae4cca01cb5107f1f70b9a316c67947b3 SHA-256: eea1bf556ff2c90935c50b1e677918132d7dccb4c0faae0e6945a368546ea654
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical detections indicating phishing and trojan characteristics. The presence of embedded JavaScript and numerous external URLs, many pointing to compromised CMS upload directories or acting as link farms, strongly suggests an intent to redirect users to malicious sites. The primary goal appears to be phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://crewmak.ru/uplcv?utm_term=plants+vs+zombies+mod+unlimited+sun PDF link annotation
    • http://studiogiamberardino.it/userfiles/files/xofodudujekonapu.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/wamizemu.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/xanagujubimope.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/06b915f8460a83f9712432278efbf7a5/nuxapofigeb.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859ef67ae5---90521582552.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/60861515996.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/71582497033.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312281297787.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210904194913.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135b427980ed---26626848883.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/pirerafubu.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_213145.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6f907e87bb0dc131e16a4ee5b8528441/17800485901.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c7def9b4---poguralamotufodide.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/54244696791.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/97091722393.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/sesorito.pdfIn PDF document text
    • http://prompol.com/media/file/dilitiwop.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/nefuxitumodaxupurelenuzu.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/goragapidivetewadamesi.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/8858773970.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/95058321676.pdfIn 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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 10676 bytes
SHA-256: dabdcace094ed7489043f35e63e61a3997940d391818ca7944b95728994c0d64
font_01_sfnt_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 16820 bytes
SHA-256: 0c26204e473ff52a805c6f555df2b823943ac1b0e8d8d9bff38a6b367b6a2f89
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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