Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ba70bf9129297d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 04:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9bdaae305f4f5b55c975849a72b67ae SHA-1: 765402ce314fce0cf722371b3f0806c858c7e9e7 SHA-256: 28ba70bf9129297db826b5757ee031f1d9243f75dc41309b0c3832097ecb42bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=3d+wallpaper+inside+phone PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138eacde96e1---14000202736.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/29256128880.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/pomomegiwu.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/44725977741.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/50449697514.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/53984801296.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dnhji1v662vgd4km1g4qpa9d87/2477404120.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/sizironapitowa.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/52605384978.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9e29186c2c31a8c46d17d5eb3986d577/nexitajagipawibasigexumo.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/kapobuzifiwugujaxav.pdfIn PDF document text
    • http://askaudit.ru/price/jadojokovok.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/16594725904.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/18762811732.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/40476136680.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/pm7jh1euo23r8g1lip430vg703/47306388820.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/94231333638.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/21563336874.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/12785362832.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/siwenobepumurowavenulaze.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614282f2afad7---19674240831.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/veraxanufokelila.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gesijarejuxipaxipidejilim.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/mobunoxuwi.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/xunumokefo.pdfIn PDF document text
    • 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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 17372 bytes
SHA-256: c43c3d7b7a4ea1ab695473ea6d1efdca6e0b086defc1d41df75bb23bed2d8476
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 10552 bytes
SHA-256: 94cc351e00a95c26d40952d2cf03970ffe29c5831c0156e9a49d4d301e4e8bb4

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