Malicious PDF — malware analysis report

Static analysis result for SHA-256 8014576ef0c39cc6…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 11:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84acf9255d7ce6448ee3312ce6cda0e8 SHA-1: c1ec0d4e46b7569ceb014d31c55184263760e425 SHA-256: 8014576ef0c39cc6f2d2f6160d73a4f33a4132a896cdeebabea8c88a9d2745fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics further supports that the document is designed to direct users to potentially malicious content hosted on compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://olterus.info/contents/files/95193523011.pdf In PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xarunenodenowu.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/26844780803.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/3527412296.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/gimiz.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/darukubujagapof.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/556576e2bd6cbf98187c4341052f1236/pozapiribafumiruluz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161453ff0cf0bc---luneburadi.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/73094922483.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/mudosufepewiz.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/97021404495.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141bda529cbd---riduzaxobabanimuxibigi.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/14889395153.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/101375948.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/mirugedaroxu.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/42650732639.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/mogev.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/bef7ede27d0b7b7ff98d98a8a82fe122/52525608961.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/mitowubobikobudimukuk.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/pijutawelekikugilat.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/suzubunuvojijokewinesuv.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b798a7646c---71921320657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+android+apps+for+picturesPDF 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_off0000ad79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD79 15232 bytes
SHA-256: fdfc6634b5e061e2661e93bb4e11eefdfccb6bd8d5df16a544317ae3abe3b585
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 10644 bytes
SHA-256: d76487ab740e12232ef28fd36da3ba5cdbe0fc775a53900051d8fc8158d0e1a7
font_02_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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