Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5ef3f29ad04dbe…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 03:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6182e7d1499903c4bde2e25ba4793530 SHA-1: 645ca0dbe33356d03687f9739c7086a0163d7406 SHA-256: 4d5ef3f29ad04dbe3f3fb2d1678cab1ac989f0944ab10ad8e3abcf735fa5bceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://affordableadobe.com/ckfinder/userfiles/files/8498032592.pdf In PDF document text
    • http://ingmontagna.com/userfiles/files/33216563967.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/613892d07de2d288858884ffba65499e/61802445957.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0qskipc5n831ouk25bbq0cm961/16744497198.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/55685595861.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11427774849.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/nosokalajir.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/xusobakipejagozun.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/33706889352.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/99119540363.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773e9f0cdf6---34473199489.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076914dabf1a---45834012691.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bff2c3dfe70a5196fb1a541ef350756b/dazidesarow.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/29721300730.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f734776859---xesuwaperumezim.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/94870417603.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/tomiwukanadinajupena.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716700dce89---kilojuwisu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe15a294d8---midifaxukiw.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/92091366894.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/86167079363.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/gexamezanixojef.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rch0klp99onndim3djt0g3odac/87443203607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=baixar+editor+de+pdf+gratis+em+portuguesPDF 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_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 18724 bytes
SHA-256: f17b1d87a0b7c0674665c3056712509546b85d540d87acb3acb5fd72c880948c
font_01_sfnt_off0001144e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144E 10944 bytes
SHA-256: bf5769bc949f4c76ab3395c0af61b4b976125d42514828bbf7b68c77934426cd
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1