Malicious PDF — malware analysis report

Static analysis result for SHA-256 604533edc3dd7ae6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 22:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a70154efaac95c957278285c430d3085 SHA-1: a9888b7b9e39ca444b36869ecf170ec47bffa2ee SHA-256: 604533edc3dd7ae6f84107c1d297e2e46d77056734e023995b7824c52643bd01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites acting as a link farm. These links redirect to other PDF files, suggesting a multi-stage redirection or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=funny+bunny+gif PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c991c3737---56269530541.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/6529064175.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/ximagaxakofud.pdfIn PDF document text
    • https://limadelimon.com/images/file/29842748189.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8f5f1ca92143cdab0a87c1ff0d55a311/dofiki.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/72851480094.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/57531652495.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/14728231113.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/35514730963.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/17701063124.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/40130303630.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143947464adb---4235616689.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/fujasunonavakidodup.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614480fad6842---99418397881.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf5a62119---ratawebonunixori.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/92122577016.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/2419575194.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/44687150410.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac96c5349---41613495925.pdfIn PDF document text
    • https://mikludava.lt/images/files/zikupuses.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/93070788205.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/gogutinodigadan.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zenida.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_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 15880 bytes
SHA-256: 0a93f5064a4f55eaad97f8767efdd37896985fd3254254b96735b766407f343d
font_02_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 9896 bytes
SHA-256: ddc13cb6c09876930568a83e208be702a69a8d82063a094e23f7853b6b54dab7