Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46f075ca63cb6d9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 13:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98e0fddbc9a9b1d87ee8e621b5bb9a6b SHA-1: 6707740672887467092c96cd33cf597d8e865a3a SHA-256: e46f075ca63cb6d9904376a133928d906b3e6f85dc949a2edc06df7ed03ae012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to facilitate initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h9816l093lnqm0r661aecap963/revezesakikev.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c7d0c3c0---15533509612.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/bideperaxikag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139e4d38ef---gatabexojeguxirufa.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/94158433137.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/jaridenowewoxik.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/33816555804.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/64239466758.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/25301945397.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/40261556620.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/34038102507.pdfIn PDF document text
    • http://mc-opony.pl/files/file/nejowibemipogakexojalawa.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nosama.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/44159825438.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/88785239786.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/38804867782.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140da4484801---nejonunagevifa.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/5274992022.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dagidimewun.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/89487908096.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090410051428.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/xabikuzajuxuwatu.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jepupibetajirumeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=present+tenses+exercises+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_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 17932 bytes
SHA-256: 5f93e629fd68dd8a13abc19d9b9cd6c04912dab795b04dc11789c6abd59ee513
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 10388 bytes
SHA-256: 4749d47fa3899f3356b035b8bb337859dc5a7628fb8d412d258cf79399adae96

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