Malicious PDF — malware analysis report

Static analysis result for SHA-256 4187d7c652eaded9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 05:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8a6f2e538164e2a17ea4628d1aa4c3d SHA-1: 4247a9e309b08dcfa6631cd6486a0f7d5e733e2a SHA-256: 4187d7c652eaded988416a7fc3c061a0081a61e694fbe9dde663f71e93883ae0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://elmbbq.com/uploads/files/kizusidavisetajiwimem.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qu1s79vnije5987jkit3btfi8l/fiwufofaroborotajitetalut.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/55122416624.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e8b409bb---melaliravulosizusemaduku.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/44199376094.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6pum1oi3ihh3n818vptg7kstph/62675452921.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e7e7f147---34504239751.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/rajitomegij.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/rukitufarewagirulije.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a47f0a0cd---zuralerotowelitu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/pibibokujusixakef.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/mixinusepixigapipuvila.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nojetanafamavawadej.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/velujaxom.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d790aabf68---pomanowoxiwi.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-2/20210702062425456330.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bizimetewunakun.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f11da081f---39719369573.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/sobamekikuxededosebopo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f4bf88fd64cf87913ce72b26088d7e55/3894340149.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/xesewilekuxowixono.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/62282161537.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/74182400676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=drunk+meaning+in+englishPDF 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_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 10528 bytes
SHA-256: f178bb481ab6cc2e527c555d6458bfe0cbe26b17d75b9eee3f3025957119a0d2
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 17696 bytes
SHA-256: 98968afa0420774b59fcb6e6dc95274034258403913ef393b65e0ee6d93355ea

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