Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f224856037f2ee…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 09:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c52f0916d81e2ae4f6bcff05ff32a00 SHA-1: f9ba97901283bf5dc041e272e715fff1854124fb SHA-256: 63f224856037f2ee74a8a5232f823ccb5c87dbca4b5bb9066a742930a50e7658
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and numerous embedded URLs strongly suggest an intent to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cructi.ru/uplcv?utm_term=without+tight+junctions+in+certain+tissues PDF link annotation
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/463ed76a9f4baf8d9daab1befb1ff0e9/sonozakidepifiwame.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/bexej.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee10bc91f---bimala.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3552012c6e25aee23b038c8c88bae71a/zuwanaz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef1f927f6---mobogowowomebaji.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/39573550876.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e29a82583d---tenas.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ckla25b10p9chamt671ufsnapc/89516510616.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/wonetav.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/52012953304.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39d81ae49a---gubuxot.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/zuzogawotokakiwepojek.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/finolilolavum.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/47ae64443d0808c17f0df1670f4fc747/filalinutarewulo.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/zurapenotakifanaz.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/65241600784.pdfIn PDF document text
    • https://service-panev.com/userfiles/xeritupefuvum.pdfIn PDF document text
    • http://robbes.nl/media/files/95321373972.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/6492655718.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/dajufewupegesapatagute.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/bfc8fd46aee540f659b6ab57f69d4b1c/18810083985.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/38327520588.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/fakitosib.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/73980039251.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///18809015590.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c1391ac2a48451c3c2cda5d965b05f0b/66101917117.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_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 16900 bytes
SHA-256: b66a4a21285461cd300bb335e603fa802b04a07f717edff598b85c6bd2b16692
font_01_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 10688 bytes
SHA-256: 60198a00f797c1a3407fe9b7984812a011c05da013fa595e3efa0cb55fbd49bc

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