Malicious PDF — malware analysis report

Static analysis result for SHA-256 6654e72ae4f88ec6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 11:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd9c1af6767b1a80f9a7d4d7b2f7d31f SHA-1: 5fa398d6655197ecd051476062b272832afa99bb SHA-256: 6654e72ae4f88ec62a14b44ea78eaebece792a1dcc49c9cc22efb98f95f21711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=hashimoto%27s+root+cause+pdf PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083358862f8c---kilodugisewenuwanufix.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728cd26fe3f---93510902357.pdfIn PDF document text
    • https://palet-school.com/files/files/tobepekulukoluz.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0c6cbb5e9217a5b3f8760994f36d5a7d/bovav.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/puribimurepitagulubove.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c471cd31196---47841525136.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/wenuvefoborupix.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nujif.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/jatofixidanirogaxakosum.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/movudofitojoxuriza.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ba4351e80adad1619be10e8ca797f4ca/70008694931.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210707034915166.pdfIn PDF document text
    • http://haki.vn/uploads/files/39034677868.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/14539264460.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/juxutobenosi.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/vibasetomepurozipub.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f762a6dc56---pevow.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4420e7086---70351415214.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/41837850858.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c9076203af2---dakenajefinadupam.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8f5b0afc---wulukepukazopuruzusi.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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 16064 bytes
SHA-256: 9edafe865ecdd18f05bd0be4b6a9c6b16a3d9371d65967fd771f20702721905c
font_02_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 10860 bytes
SHA-256: 4bbef22de3d93af2d1cd7373b9b3ab3c039119e642062d1d5f5b66454a79b159

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