Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2fc44c3fcc1f50…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 02:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 621903725454aa9c7eadbf575d493c24 SHA-1: a6ee7a613d22a5c833a42a32f1e64ad15940bdb7 SHA-256: 5a2fc44c3fcc1f5043e0b34e37d13483d5b9ceb6b13ef4ad837efc57d087e4e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple URLs hosted on compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a21d11e2627---16890590166.pdf In PDF document text
    • https://shidoremicrosys.com/media/93040864438.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3d439558---4079185270.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///22957974890.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/49000161773.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jqlidatj41u6ms9d2lmj0j6mv2/3885494692.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/61127269014.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7fb1680d3---14817472414.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/76319621970.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc81cb93d4---gupafeje.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/97777145667.pdfIn PDF document text
    • http://metabolit.ru/files/file/62683872940.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdee75214---4696881141.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8ed55cce303421411573ed7bd8c7f5b7/76218131021.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/57987483322.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/12965386082.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/juzege.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088246282529---77233888842.pdfIn PDF document text
    • http://hasyo.net/files/file/364015967.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vbftkqsbr3qo1uo2dnf033h3g3/kobugodekegazelutewazezez.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/letizubeto.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/taremitezupa.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/37996400726.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/56335830791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=entrepreneurship+development+in+nepal+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_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 10912 bytes
SHA-256: 5ca663f5d890cd5434943648916482805f2b3a53cd3e75116188ccb9c19fea27
font_02_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16260 bytes
SHA-256: 85b23f6c7f059f519536c0a05b298c28dced6d2e19e3c46b5bcbec5c22cacd72