Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d3a215f93aa67b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 03:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fe768a80d9532e96b5f62dc2781cd96 SHA-1: f4c420535dd7e76139527a6d7321b82759765290 SHA-256: f5d3a215f93aa67b445a07e0d6afdf6c45404b1cfde6390b2c4aaba5faa8a2b1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs suggest the document's purpose is to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://video-cycling.de/files/file/xuwexofo.pdf In PDF document text
    • https://cordovajewelry.com/images/file/kuvefovi.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/womozabelomipos.pdfIn PDF document text
    • https://nevisnews.com/userfiles/75967738770.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/vekuzapolimegixakefi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6e34a591b9185d3a6a27d614eea40ca8/11848431570.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/9821737757.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109060714147176.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ffc48af3---50837182307.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/78178036580.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/17542522779.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/40775720576.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/31678830475.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/31970852187.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/89525547314.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/wuwowadezox.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/pezilosakanejomiromad.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/2861201841.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/8083397222.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/nopuxiv.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/78540296995.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/rafijanaxikabijenuj.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/tizujupenabuvupup.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/13511317313.pdfIn PDF document text
    • http://jiab.net/userData/board/file/sikepexezazaworipi.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/teligigeru.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ch2ff9i6bvp4q1luvpdbsa5qsq/jetep.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/27569625150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hungry+shark+mod+apk+unlimited+moneyPDF 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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 11136 bytes
SHA-256: 0a197082e35783aa7de53908f60a02432223f6f77ef312eddd67c3478073e020
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 17008 bytes
SHA-256: eab607b1ed62aa04134a0552ae0f04cd4ff5ade57900b1539043572b3f3444a6
font_02_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1