Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa44135d3aecae8a…

MALICIOUS

PDF

76.4 KB Created: 2021-08-06 14:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7252fae6f50f4201e1afcba7b295afd2 SHA-1: 6ab1676b59c362216cbe6d0251a884ca0f2c29f7 SHA-256: aa44135d3aecae8ac1aab62d6849c5e875a91f05b01430b9dbc0c2496b27d985
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c1f5692cb587c99d2f5a91e209d05c0d/begadofizezirapoparifomo.pdf In PDF document text
    • http://kipia-nn.ru/userfiles/file/18694735774.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7325a436750ee24db6d4383592406367/24031028546.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/43808161367.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/14437471963.pdfIn PDF document text
    • http://ahchala.com/img/file/wotepinibed.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7e0699e87507d5e55b5d3d05b675eb1e/mezibasibugojaxidazuzuxul.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/livikug.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/zazedeze.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/75890839453.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/971bb8fc353395f7fdef592019341499/8776706829.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a1fc3aa6---rovomomafamegalegovisora.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/eb83a08885742aaf918a4a96ee2e3fef/92403451417.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/lixokemofatenonafafafuv.pdfIn PDF document text
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/80925502931.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/10290811682.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/mefowul.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/sufafitojudeku.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/387cn9760r3sr7ejvo0k9ge9gq/80986954997.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/94475254742.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/70747907774.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/pojusa.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2fd83fd8006e990d27a26e2d79c0252f/jozitorodibalesivuti.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/66953087581.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a60c6e60---xofirivawuzuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=algebra+2+workbook+answers+pdfPDF 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_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 16220 bytes
SHA-256: a71c3b6f4fe8afb211de77f130b4ec4a5252d5ffc82938379c35b5f4ef8ae5f7
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10904 bytes
SHA-256: 19e45b163d4f91a6aa8b6a35203ef7e6d30a4110d34c255470e19bdf01a2b49f
font_02_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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