Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb71de41170c8f21…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 22:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cea82c676d21d1f873d71805f6b742b SHA-1: 05c64d50ec1d5a1aa0ec0c5d1d3bbf8f54c7678d SHA-256: eb71de41170c8f21ca715635a3595330548befb1acda0b0e1f9b5f3b31a2f83d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage download or redirection chain designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70423e15f9---larugeduxuvedomiwexuxat.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea9b24190---nigebufosam.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160959fdebdbb3---vigakuzub.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609845e74ed33---18228691463.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r6lbo0hcsifr8pjq31poohuis6/zalezorobilanurifubepub.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/45935039479.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mjmlo2dd6cf80ig01qnb2vvinq/wewege.pdf
    • http://norilskgu.ru/userfiles/file/fabaxetakisirogafunizokuf.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231b9b9f8c---58569412378.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/mdf4c00k98u4rungt0br9ko3nk/sulakakegunu.pdf
    • http://prinsart.ro/uploads/files/kigafemi.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4ed763de---detamawulukazotumokujif.pdf
    • http://changju-hotel.com/CKEdit/upload/files/31201166891.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/eb7da394f9745293f8e4f555a3139c59/rukuxonivefuk.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1e6995ebb16c78c8f9ccae80cb6957aa/vifovujud.pdf
    • http://kcde.kr/userfiles/file/35592205124.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c61cd5857f5---gaxiduranu.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d90685f7---vewenujamemubuvur.pdf
    • https://lemanssrl.it/file/92634571646.pdf
    • https://alexandrapanayotou.com/web/images/static/file/13401592195.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f27531df9af1cfaa8ee825ce97dc2276/wixexadisujuzerig.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/371eac4b1d26fd812ce0bc1003d7632c/wifojuwejux.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca16d35b90---99041043122.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=definition+of+letter+in+english+grammar
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16792 bytes
font_01_sfnt_off00010456.bin
a28b76b6a07ffd9e32b8e76d24a9ec2af7466848e25df2d9436d6e12db7b037b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10664 bytes
font_02_sfnt_off00011c91.bin
30dba79bda3d4ac4fd6cf70a64156192ea635e6ed217792c7432fcf5033c31b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 18000 bytes
font_03_sfnt_off00014c10.bin
eb51479a007fa186213956a2a41df21e8e44f6735dc6576bc3fd0fbbb55c55ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C10 16340 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.