Malicious PDF — malware analysis report

Static analysis result for SHA-256 77750aad54af0d93…

MALICIOUS

PDF

113.2 KB Created: 2021-07-02 10:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f06615880541fb0901f912dbd635e8f9 SHA-1: 17ef7669e9fe6e129163a9218bf4bc53a2312de8 SHA-256: 77750aad54af0d936f2cc3214007a381e125413541504f855194585c608bf585
136 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to facilitate credential theft or malware installation. The document also contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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://mevlanaasm.com/resimler/files/bixilekuzepis.pdf In PDF document text
    • http://bachova-terapia.sk/images/file/lirovu.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/n94uklqm3e9c6v1926fk56ccl7/92147464833.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/nebupadujuxevi.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/314208b73509df9c216eb537bd2fbd0f/luxog.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/36083425130.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kipefutadedu.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/24647548221.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/22e1eaa039398acf3917d9e7596a8c5e/28825683324.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bf2b308ddd3058e5ba73792e9280d9a2/limefusatuvo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a8538549a95---kabuxuzomafi.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/robufimimiwin.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/1c8aa3779927c908210f41434987056c/sudodilu.pdfIn PDF document text
    • https://marosme.ro/hirek/file/penokewowagadolufubo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be746929e8d---karewitadikev.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vojukalurezasevefemube.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vowunedajubu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/fl8qu9f8av5jp27stjpu9q7jt8/49278266981.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcef322c5---sukeviwiwegosej.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ffnjm6ncrjrode6vng71nab2li/77713296468.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/47860095951.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f3c760ed---10600641191.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/xujemivovokutovixone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=a+selection+of+modern+english+essays+book+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCA 11480 bytes
SHA-256: 39b58043e2c69bb3a15435b3ba99219d75785c4eb971e2e3f924a4cd981d89dc
font_02_sfnt_off00017a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A63 19736 bytes
SHA-256: 08afe7eaf55168e6bedf3aebf451470dfd6aa3b62cde4c15d4dff5fdf588577e
font_03_sfnt_off0001acfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACFB 2096 bytes
SHA-256: 751cc7de062666ac55f9e300d2ad7137decc138a069d1bbadb323c52b27c1291