Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c248fec403e5da…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 18:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea959ce408219ef2703441089b43ac56 SHA-1: 7ceb6e58699ca7125fc2e3fe4b5b19c0ee117e05 SHA-256: 63c248fec403e5da17a615fe1448ea97c6cb4252965a806cd93c5a4fc251f838
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document employs a social engineering lure, instructing the user to install a browser extension or update to view content. While no scripts were directly extracted, the presence of numerous external links, some pointing to compromised CMS uploads and link farms, suggests an attempt to redirect users to malicious sites for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laurallo.com/ckfinder/userfiles/files/jujaveluruvok.pdf In PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/tisekelobil.pdfIn PDF document text
    • http://salwex.hu/file/bokoli.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/36657729669.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/807501524481630710556.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sabex.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/tusevozitemoxukagosu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/3260897310.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/5819305274.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/97268474907.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/94850714959.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/mitogasale.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/wopotemu.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/28604206057.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/13271012834.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ab0e6eba4---buteratawijulopevagi.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/73079795229.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/82086071315.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/disali.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/72628699424.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/32521462775.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e75a3ab3fae3c8ea7e35a11d967326b2/labipibegasugozodonu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613223f22d287---66667250334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fortnite+free+skins+ps4PDF 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_off0000c2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CB 17648 bytes
SHA-256: 8eb45a772dad5cb67af2698e976172b7b89f3624911137cd08c0e827bff1e47b
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10292 bytes
SHA-256: c96872a52ae5076dc7feb5b264a919425016470f0b38e80d27de0b3985abe767
font_02_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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