Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ab53828e16e24…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 17:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7044edb1ee5e8a9c2fc407340623c5b1 SHA-1: 195fcff16386e69c5cbb95957007aaf3108e6539 SHA-256: e33ab53828e16e246957aefa447cd8b717eaf3e0e089eddb3a7ac38dd1095ada
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and it contains heuristics indicating a browser extension installation lure. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of multiple links to PDF files hosted on various domains, some of which are associated with compromised CMS uploads, suggests a phishing or malware distribution attempt. No scripts were extracted, limiting the ability to determine the exact execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://perfecthospital.org/FCKeditor/file/35495640175.pdf In PDF document text
    • http://locthanhwindow.com/img_duhoc/files/91728378209.pdfIn PDF document text
    • https://tch.lu/files/files/96846133929.pdfIn PDF document text
    • http://ledins.lv/cms/file/demixexizujekug.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/13506057900.pdfIn PDF document text
    • http://atek-ent.com/upload/file/gowefasibade.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/46960464443.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182d9e52a3---xojutirelazizumam.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/gexaxejidewigofodiras.pdfIn PDF document text
    • http://fxlcd.com/upload/file/49425655570.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a99481df7---29557559880.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e52df698---57619323518.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/67498253109.pdfIn PDF document text
    • https://wasael.com/userfiles/file/bijurejelo.pdfIn PDF document text
    • https://10fci.org/userfiles/file/71462896613.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/20373452253.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/piwadenorefipapepabi.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/rawatizesidotugawe.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/85176709277.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/kaxonezobitokexajudu.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/bilugidugiwose.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/74522509862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+save+long+webpage+as+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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 10764 bytes
SHA-256: 10efd41fe11a84956d74d39ea03f26089f2bce67c9c81d1b3e0e0485cd1f6947
font_02_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 18048 bytes
SHA-256: 4c4a46b369447eb34fa5d3c151b1bc44a82d84b8f899a2bf1970d39cb12dde3c

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