Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dec433d3485bc8…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 05:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bab8eee5cf525a11521f4738c9044c07 SHA-1: 5d36170ac2e76b6097f76b733653a31f547aee08 SHA-256: b9dec433d3485bc8eee4773923002aa26b662852e886a83a0cb8f41106fc53ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the classification as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b477b0bf4020e5ff68d2c78374334141/ketukoratoraxuvekudow.pdf In PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/vegokibalelojutuvesava.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/44622167287.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139d315efa5f---befadugovuduzatejexuwepa.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/12464747875.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/57618644785.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/sorerewotom.pdfIn PDF document text
    • http://skolky.info/foto/images/file/dumesolipisavap.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/nokilokasobutibodop.pdfIn PDF document text
    • http://capableapp.com/uploads/files/jojejubemezalalulifisu.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/54437752324.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/13078148344.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/rejixirijovopinepudi.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/fodexirunad.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/gelunukidewazuro.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pqdmn2sj83pfo1cevqm1m873d9/magepabovinalim.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/38188025647.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/77276175940.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/95777868389.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/6685106304.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/linunukurotufufufir.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xunef.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/damojez.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/fazepinajakup.pdfIn PDF document text
    • http://tcihk.com/userfiles/lukejolexonevonimoxiru.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/15918432087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=past+perfect+exercises+with+answers+pdfPDF 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_off0000c628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC628 17384 bytes
SHA-256: 1527db78a70d30cd57eff1454094de29cecf39a682ddce036c8252c695e08ed7
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10740 bytes
SHA-256: 72b4872dfedbe79684eefa2002f890111ebef2164e37fb366e0064841684cf4d
font_02_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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