Malicious PDF — malware analysis report

Static analysis result for SHA-256 7875435602cb343d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 17:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b1ef6785c53b51cd440f379577f19e7 SHA-1: 4dad8ac3d874d49f8ee1d147564b07b014fee2ac SHA-256: 7875435602cb343daa1508278817db0201ffa94309bfb48db036f06b4ea61ef4
236 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including being flagged by a machine learning classifier and ClamAV. The heuristics indicate it functions as a link farm, potentially directing users to malicious sites, and specifically employs a 'Browser Install Lure' social engineering tactic. This suggests the document's primary purpose is to deceive the user into installing a malicious browser extension or update, likely to steal credentials or install further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418bf96afe5---vesud.pdf In PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sanadawaveguzol.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/48885623316.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c0741099---57560897126.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101951138539.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fe71470d---kodukofatugegadavad.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/welazijaxakakolekujid.pdfIn PDF document text
    • https://amgaa.org/temp/files/zozileberitukiwumepewavux.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/99529006372.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/najokawur.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/41915215716.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/82929569924.pdfIn PDF document text
    • http://jawarakreasi.com/file/8272640699.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/komulepetiribuzimelujuli.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/15833318212.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nojuwelagajagetifom.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/42996214372.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/dogaxinolifexigubebaliv.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/83293411820.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/98322513088.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/43117772887.pdfIn PDF document text
    • https://2winit.com/Files/files/wivapusirozize.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/36933321781.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/tudovovixejitifesemob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=desktop+browsers+for+androidPDF 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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 19324 bytes
SHA-256: 3a76f39e1c289576d1b42855890c7d9bc61ff0386209852682a881c4ed27aabe
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 10764 bytes
SHA-256: f1c1e1e18d6af56ab5c85c4bd5a81b3e3dbdd3e54cda2a19f5eaee341aedc5a2
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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