Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3aaa607d4d5a3a…

MALICIOUS

PDF

94.6 KB Created: 2021-07-06 19:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a82ab756899b1d8425d4b21e917741e4 SHA-1: c2323d99a9d99bfb060dc33cbc0f6b8303feca70 SHA-256: fa3aaa607d4d5a3a2357e3aa746e4e711aca1412c11679468952c70166a5b131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that often embed JavaScript to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=how+to+draw+anime+guide PDF link annotation
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3771cb25---fosirawe.pdfIn PDF document text
    • https://inncredel.com/uploads/kowekerunorerorebutu.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/reros.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/votelutoka.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050402534915.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608edaf7814fb---pagilifamagube.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/09d929b0c5dbaf16810c300300d47209/vimituderawik.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c630abd63ee---butezigolovotiwuribe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2fb7e485dce5aca34ee42345b98513f1/sodetuzosap.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lewawabubajusol.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/58902100021.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/61e75557e1e0afd25f2c52a7899e7048/22528225891.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/j7dod2d3ke8ntkph3oe6v2cm7g/mebawefaviwop.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f995556b9---33492087615.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/magabotevezosonagemel.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1ce3057a7---sufupegu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2a783237---jobelalekojedajorudi.pdfIn PDF document text
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/baxosotatevekozibe.pdfIn PDF document text
    • http://www.polni.si/Images/files/40376195861.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4b9716e4d8383461de1d0a2ae1798dee/76996227045.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077842d547a0---45009901459.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b971573f2---57150652700.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/nfvnkqlrf0jagj6f2aualspdr9/79881640497.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_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16844 bytes
SHA-256: d081178030891e604ee19f65ddada2d6b0f22f32bda0451496bf062cb94c56d8
font_02_sfnt_off000155b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B7 10552 bytes
SHA-256: 2291b245aa1f76b0c7526a3b8d41f563921057536ad9aa03a45e5930a5455bbc

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