Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4d69c58f8c6b4b…

MALICIOUS

PDF

93.8 KB Created: 2021-07-23 06:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 955d238f974aaae45666457160987289 SHA-1: d5aadbedc055009f3ab73db94819522f923f01b7 SHA-256: 6e4d69c58f8c6b4ba3a05ff5c5262bf74b43a4fa65721b616291093189434072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support its role as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074341a626b5---jiwamogenotekanadajokeme.pdf In PDF document text
    • http://af.ssla.ru/images/fornews/files/molivukutuxezagafamu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc7d78057---guwobubenowukaka.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737463d9fa6---1911103375.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/639e44eb88b123089212620a71b392f1/30970611229.pdfIn PDF document text
    • https://subarini.ro/mm/file/perufokalab.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/42002390209.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/38326391560.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/vupulinebiberejewuvez.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/37275627451.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a472329ca85---97624076178.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c31800369c708963aa8489290daeb765/gujufezeg.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/12817544016.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/iicbmljmkldc78vucfpjfncnre/pijajimekegene.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ae4a1ae31---fegobimekumaf.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503010906318619.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kozenokada.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcf6b4c3e3---39748308305.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf8d68d86---zerofifi.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/fezarorijuvovuliwiwi.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/18204427395.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/61933591599.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3781531cd7c6bf87ebf5cf3c5fe54a61/tidajarezalemevivunozeg.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88774e25---46512919724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=riverbank+state+park+poolPDF 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_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 10588 bytes
SHA-256: 7844992833372694e8436f1b363a66ba3d966fa2e171d6c12950b4b54acf068e
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 18452 bytes
SHA-256: ab843a6a5cbf98133328100510f91601cdf878537b2ca0ebe65bbf48d77a0d30

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