Malicious PDF — malware analysis report

Static analysis result for SHA-256 53345cf556b0f655…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 20:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2ce17be3b164eae3c56eb0c5b430f40 SHA-1: 388e31af97840eb3931db7dcd67b3f89fe8f234a SHA-256: 53345cf556b0f655695cc85d8c1c1bc29f6977640d1102494081e0187fe72239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=...', are likely part of a phishing or malware distribution scheme.

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://pixomot.ru/uplcv?utm_term=physico-chemical+characteristics+of+goat+and+sheep+milk+pdf PDF link annotation
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/35664910378.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/kugapiragazewaritorow.pdfIn PDF document text
    • http://unibox.lv/files/text/litedesev.pdfIn PDF document text
    • http://chineseclothingonline.net/File/fazavexanelixox.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c7897ac3e38f2938f7b6da174426a95a/7501244871.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/jazapuz.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/fumezulosi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fced533b6e9---11358942200.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/38621959978.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/duzoribevuxuvoluguzikof.pdfIn PDF document text
    • http://deforma.it/userfiles/files/foluravotudu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gululep.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efa490d1b---gujumerukew.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96bcbe05ef---gipapevedijaziwunopunelon.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76770a58d5---kopanabilanijutebasunev.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/sageluzot.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608334d1a27ba---fowofinukapiluve.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52a3cd38a---kesipigasaxasem.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fba4067a17---91664114591.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/mixodelotogilerevuvubave.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/dipararasisag.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe997eae6---lifipepavaloguxuda.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/77a1b397445499ceb29ce8919cd9f1eb/9225436586.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_off0000b2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E5 15656 bytes
SHA-256: 3186a10a12cbe51d99ffaf0cafea885ed0a63c5967b6570ffc9c1c7d1be1cd6e
font_01_sfnt_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 11308 bytes
SHA-256: 2c4e56cb21848d1efb695bcdfc17815bdbce6e2c493a9b5013f83acb7fd439cc

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