Malicious PDF — malware analysis report

Static analysis result for SHA-256 db97e85c149fd33e…

MALICIOUS

PDF

80.6 KB Created: 2021-08-11 00:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7444b109e7cd0e365c13a407fff90baa SHA-1: a2b3fe1ea5dd279b66804fae599d81fa3780e95a SHA-256: db97e85c149fd33efbb05c491c8739b920c404c098194a71291e731a866cee02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://nomylo.ru/uplcv?utm_term=jojo+siwa%27s+real+phone+number%EF%BF%BC
    • http://gazosilikatnn.ru/uploads/files/dukejajirogutopi.pdf
    • https://pypconsultores.mx/userfiles/file/velidupiwonajumudis.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6venvb6gnq5ejgag3bbo4s45b8/52328724678.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c24bff8c---romorubasekemudegokeg.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/50479888952.pdf
    • https://hometeamcorp.com/images/usr/10659606825.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab692178a6d---lupevipuruxikupo.pdf
    • http://checopharma.com/upload/files/8480933598.pdf
    • https://tigapilar.com/upload/files/41955077494.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/wovudexaruk.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55023721186.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a629ecaf7d---biwuwu.pdf
    • http://venusland.vn/app/webroot/img/files/67034978928.pdf
    • http://kolasinprevoz.rs/slike/files/82874087966.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ah6khqe77kf33rioomumgaf5a6/xotelotezinifi.pdf
    • http://inphuduong.vn/upload/files/33709601943.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51fe63fef---fagilunure.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088d58257bb0---muzojujetadegowovixu.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5f751444ee7ad32806202b8084822ae/nalibepuxusadojoxijim.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bd02ab8ac219fe80a117b80043d82f0e/xebutipolopamubowixika.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/157b15254e6f50e9c62b7a878286bdba/guzisizumukuwa.pdf
    • https://corpusbg.com/files/fck/file/51773100529.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d552.bin
7eae566d51900d4ddb5e6d0c898a8d5dc9e3508032d02f72c39367ea8146cd0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 16824 bytes
font_01_sfnt_off0001012b.bin
c07d72f9473bc97d7d55e51719626ab94d760bd5d350f104ddc841049678a7cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10908 bytes
font_02_sfnt_off00011a08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 16792 bytes