Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aef965677a8ee09…

MALICIOUS

PDF

95.5 KB Created: 2021-09-04 20:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 328e3aad7cb48543c13903c79bb7009c SHA-1: b7600172dbdd9bd14b5b2848adda8ad0dd624254 SHA-256: 0aef965677a8ee0906ac985442f18db2837ff399dbd0b7371c01f144898640cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically using a password-protected archive handoff technique. It contains a link farm pointing to various URLs, some of which are hosted on potentially compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of multiple links and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicate an attempt to trick the user into downloading a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://andrejc.si/files/file/36398537000.pdf In PDF document text
    • http://qiuyutv.com/userfiles/files/20210720065624.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/cf5a8e256a604f5db8c24a1f85d5826f/95441434203.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98a190b1ccb6495db8afb92712e14a6f/jewuregeri.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d255b218---poxejalo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210715/file/somebaxoraxulo.pdfIn PDF document text
    • https://mkart.it/uploads/file/wezoxubakegi.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/49540747614.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8ca960a5c04fc22f8331b5e43cc9ca03/sodeses.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/4556144421.pdfIn PDF document text
    • https://fratellifurloni.it/file/76028293054.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ca0ppgjhdbmh487eqcf99av6jn/buboxewumibuwefurodo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8rsk4v66viusbqago1ccg8boja/33593450887.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/65955589363.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/76952951213.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cff388786357df82c0a2dbdcdf893116/muxemop.pdfIn PDF document text
    • http://esistore.de/userfiles/file/81659150459.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa075347d9---rexulixi.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/21920978431.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kixekolupivavux.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/26603683441.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/4a2d43962f0c5d7707bf3b927980688f/rekunebuvituvexog.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/519a3f08b2ea1d168fb29357d1a57e9d/3696737321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tourner+page+pdf+en+lignePDF 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_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 20652 bytes
SHA-256: e1619f8188f7ac4312958f3fb489826e900019767fb8be7cb0346d699343072a
font_02_sfnt_off0001589e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589E 10468 bytes
SHA-256: b925680dffbfb8124aaeb1199d5ee363378e3b574c8fe8baa84601cf7015a216

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