Malicious PDF — malware analysis report

Static analysis result for SHA-256 591645eeb340c47c…

MALICIOUS

PDF

97.7 KB Created: 2021-07-31 23:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 161879d01a8ec9f7a9e72242665a269c SHA-1: 66eaef3866592d238506fe16c9ce34db7b723901 SHA-256: 591645eeb340c47c8a73a39686baff0e9947fe2100492801093b998bfff5a77b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised CMS upload storage and disposable hosting points to a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://dekobonner.de/userfiles/file/tivuwavozujaki.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b512faf3fc---23650016763.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c073036a18c---nukutitazabikiwononof.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/wesasopapezuletites.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/52005445300.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a28dfb7a76b---zelesepo.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/povovotobedozuxamipub.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/tafinogotufeseduvi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e61c1e027---dixegosezex.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/zexebu.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/63052197705.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/jabix.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/13265456420.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55179eb48---fibojexuxozopivato.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/dorumejokilopev.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/80458281421.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ca1e1c7bbee---80237932000.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b292263138beb2e7560b94cba0586c2b/tuwutenudofivezivesakaji.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/402s03u434an0q3vh87o6o1dha/43262819454.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kalibemema.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zulubonuvakure.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/voleju.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3cabe106---10013176602.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be747c0ae10---kefanedan.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xexilasemod.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/75389126539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=skf+domestic+price+list+2020+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_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 10924 bytes
SHA-256: 402be6f637b03d80ccc3915a5d1da84a42cc9e5005bd47347379f0bab22ac3cc
font_01_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DF 18388 bytes
SHA-256: 970e1b052ede0883de596b2f0c50d81369092d8b2e4a72ef417fd0093537c328

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