Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd25dd5bb589aa22…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 05:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e951f60e6ed4d3024e0245cfd8967fe SHA-1: f0d79b56f611b1b59e27303e0ed48ed4254ce31a SHA-256: fd25dd5bb589aa226cee5eca780390addfc89a828cf762a0e0188d190be33d52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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=gujarati+grammar+pdf+download
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/j7p3nin2q2eha92jkhdrsvv8u3/91774556246.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/43971034133.pdf
    • http://locthanhroyal.com/upload/files/56422117153.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/lamepizabedowogiworazaju.pdf
    • http://artkulinaria.pl/sites/default/files/file/wukeluragizagedotoril.pdf
    • http://star-transform-moscow.ru/uimg/files/bepoba.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/06ea9b988672432720fc888b922615c7/dasozamalokorabegovopexal.pdf
    • https://speak82.com/_UploadFile/Images/file/91042567735.pdf
    • https://bcbc3399.com/upload/files/2063943376.pdf
    • https://atlas-consulting.ro/fckeditor/fisiere/file/95504693283.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161390fb530061---labeb.pdf
    • https://hoya.hr/UserFiles/file/ravati.pdf
    • http://cosmikkino.ru/sadm_files/sogapexuvukanezediz.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/tasovanofatifuz.pdf
    • https://mamalight.net/business_school/uploads/file/47563455427.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046387695f---roturulobi.pdf
    • https://larrialdiak.es/files/galeria/files/vofopufed.pdf
    • http://tsnpharma.com/upload/files/71062718180.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6b84ceddfb7daf17022efaadb3f1f902/lipepu.pdf
    • https://pomtco.com/technical/files/file/47535143958.pdf
    • http://montaze.org/democms/userfiles/file/lizab.pdf
    • http://ckm-machinery.com/userfiles/files/22480206840.pdf
    • http://dobrejaja.com/Upload/file/ferumikesobirujadijisunix.pdf
    • http://alda.pl/ckfinder/userfiles/files/93479177658.pdf
    • http://a2hgghk.handylover.com/upload/files/rawibosojefuronulotun.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/likasijeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6a.bin
caa6f33ff0883454deeb4a2f12ff9c68110bd43b589f72667410ca9634176300
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 10896 bytes
font_01_sfnt_off0000e865.bin
5cc40bebc04d669abb93356bbb949eb4b37e23cd3ac51d90dc675b500d8b3f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 21172 bytes
font_02_sfnt_off00011fe9.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 1680 bytes
font_03_sfnt_off000127e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes