Malicious PDF — malware analysis report

Static analysis result for SHA-256 be88dd09ad9498d0…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 14:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5e1c384f06c9f97e624a87e2bb92c57 SHA-1: eb0f2d9a688292a4d05e4bb20937f7e6822ff5b2 SHA-256: be88dd09ad9498d0cd0a7619145b855e84f584ebbac4313ebfe664bafedb2734
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sukienmiennam.com/userupload/files/wiwojif.pdf In PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210812_1DB95E2558AA58C7.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/nejamunuzoxo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ded13af101756065ce7533a843b526f8/36182006770.pdfIn PDF document text
    • http://ausafe.net/images/art/files/73385913972.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/85172790928.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e002ee2e62---77908042502.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07740ebf39---lazepuladinimogavukowagaz.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160992e5a5c23b---fubaruvipum.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021629124341.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/52417471580.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/polovazowofulenafob.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kutexuluruvazegox.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/69799932223.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/57778308235.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/wetosotiludafabetil.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160955d02e30e6---buwebifuxugaterum.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/80b70c73b5c5cc7b56b230dc7fae297e/dimawezulo.pdfIn PDF document text
    • https://norservis.cz/files/files/304875706.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd591f4fc---51567334246.pdfIn PDF document text
    • http://medrea.ru/upload/files/kagimabezujorisezifedax.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/taninevewib.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/276023bb68e7a7ddb71c756180f9e517/28283088517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=do+you+have+to+read+spirit+animals+in+orderPDF 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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10936 bytes
SHA-256: 926eb319fae822729a2108247646e217f6269ea94b383779141682d3ae903f8e
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 17784 bytes
SHA-256: 9b49f7dfc434add2eff9ac6ec1a1551e550495bbc95f71506193c6d887036dee

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