Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7648cf77ea21f4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 22:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d78999bcbf7761e1bd7dbd9766c13e0 SHA-1: d505ea28a5740168e4ebf12f189217ecec6d5361 SHA-256: bd7648cf77ea21f48fd5b64e3198c68f6ca586175c6b5e558def9b914fa9a343
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's primary purpose is to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous unknown URLs, many hosted on compromised WordPress sites, points to a phishing or malware distribution scheme. The document's structure and embedded links suggest it acts as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kolesnikov.pro/ckfinder/userfiles/files/5371820813.pdf In PDF document text
    • http://truhlarstvisollner.cz/data/file/betegonatamuzepuxiwal.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dalipulujenepafo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/295b3bf2244dcd0e05ffbaf446b9d01d/jiligij.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbef234ea---dotegodisiruxeruloxi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131571ec8cbf---gefoguxiredibogugo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3bfa2e8a---6398059068.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/29473362888.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/xinifubivilajatinefome.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/saxoduvovetuxulibazexav.pdfIn PDF document text
    • https://123natura.com/stockages/files/gemob.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/kifipobuvusazitenur.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/tazedidir.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/bodoxulafijekesam.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/17207493780.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/59051425378.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/17960229780.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/4963020430.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/jibeluxilexikevifenuka.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/88080962884.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/jojonabedamax.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/64734527336.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a8bkkav4t7ns01hjti65gopiq7/6101770301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=autofill+in+chrome+mobilePDF 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 17720 bytes
SHA-256: d02a67013e8f4ad371a6bf003a572f55c1c9612d943db1ae5b0d5bb285238a6d
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 10492 bytes
SHA-256: 40fc0ecefcc28d8afcdc9f7cdecf2f84a04c2d956ac1e21952cf95fc8825ddc1
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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