Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efef948487218eb…

MALICIOUS

PDF

85.3 KB Created: 2021-06-18 23:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f1a04854a311cdc3ec663d82c8d71c1c SHA-1: 69330e45128a500f83c2c7af0d27c8c6fc43d329 SHA-256: 4efef948487218eb6be800d96af60b6af8bf3468491ade364ab68f6e17bacf86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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://emotionpicturesfestival.gr/userfiles/file/62638149634.pdf In PDF document text
    • https://patc.fr/imagesfile/74781346720.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f813ac017---rinidak.pdfIn PDF document text
    • http://fygl.net/uploads/file/111611413052.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d279600e68---1291390441.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099f46735b98---natedun.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/6737623314.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/fowirutofaxa.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/45687767869.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zexemeliwifu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/9414668182.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0012933439a7185fe39716c52a66116/zotoxetagisubef.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4288a84e0---tekedonevalosavaburuvis.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/ruzukaluro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=monster+hunter+glavenus+weaknessPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 5540 bytes
SHA-256: ed4ead8ac26b412294e2d94ce9e17912421a8da176d5bff73f2a42663dcd08c4
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 5168 bytes
SHA-256: a2e774a5629313aafbf28359c40899a373793a88ec1911d1a76bb43d76254c80
font_02_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 11584 bytes
SHA-256: 33ca276d7a1b382ad50ef8fb2a7893f106ca82b6d3131f6437864dfaeea29b99
font_03_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 16168 bytes
SHA-256: 1ec2261e800388ce772b8b2e47fa6212ea6e10377ee28ea675067bec2ac14298

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