Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e56746a0d79897…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 11:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d948903f832e4ded72fadc1c5745e4b SHA-1: 1fc317ee31c00c1d52b25646d970499e0e0f454f SHA-256: 89e56746a0d79897bce56e63cdd3d4d6fc4d09fd02c06d4483cb04cad2fd1784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=mail+365+login PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7c5b049e6020eb8ff6cc76e34f6687e6/37903327458.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18612605620.pdfIn PDF document text
    • https://umutfm.com/resimler/files/85472168614.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/datakubizu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6f1034bf0833490758a0ae879b20295a/wikip.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/03f35cdc61451ded031803bebbecca89/momosatafewifakimuvi.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tobofimom.pdfIn PDF document text
    • http://parentini.it/userfiles/files/tilivezivideta.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021809092485.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/38952481007.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/31961915858.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/romolasimur.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/ruruvozobozelevefak.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bofudugowu.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/87593017226.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aa994d02---74619297268.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/logopijibexubabopajet.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nizesudemadepevovusubimaj.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/salataximofafitud.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/robejudaweropejixisaf.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/89911273429.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/devupanubunipe.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/9593592146142ef1d8e153.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/rowilanatesafomivumet.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_off0000b21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21C 10252 bytes
SHA-256: 5dd8884d69763c4133f8fe9db8387c59d5af20b9bd3b26716ee362c424e1c23f
font_01_sfnt_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 15268 bytes
SHA-256: 7f42fcbd8ecbdbda8851276199efd504f3e926ae1e146b67f32cbc41020a5173
font_02_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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