Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff66c8f741e94ae6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 02:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f1a6f927af88b0eb2e2943ee031c71e SHA-1: 9766a25005305518dcaf30c34c6bf98cd102adff SHA-256: ff66c8f741e94ae6671d9300a1bd78c67cdd395bb485edb15675d06ed40c5632
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension. While no scripts were explicitly extracted, the PDF structure and embedded URLs, including one pointing to a compromised WordPress upload, indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/vovuzasesipememaxifused.pdf In PDF document text
    • http://grawerlik.pl/userfiles/file/41978225500.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16138c5a7a2d0b---5018598461.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/moxozajuw.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/90127201811.pdfIn PDF document text
    • http://cjatkinson.com/userimages/50020856416.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136745cab4ed---boxek.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109040333491548.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/9754997225.pdfIn PDF document text
    • https://soechi.net/userfiles/file/xopadititijavukemonojet.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/10846353966.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/dalisikitoda.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/dijapinixaselipawekaw.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/xevefozujule.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/tubijosetedofisuzulef.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7788232ab608efed79d3c664ae86b590/5252493037.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/jexewixanizijavidepuj.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/92089220050.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/bilofazov.pdfIn PDF document text
    • http://strap.sk/uploads/files/98353770538.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/tulobepidawegigamaxuw.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/wofaviwil.pdfIn PDF document text
    • http://schubert-hh.de/image/file/24811012854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+selected+date+from+calendar+view+in+androidPDF 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_off0000b969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB969 17120 bytes
SHA-256: 42c938ee17e1ac7e1c8d05347229cc694f5c8b42106eb33b0d6922c2d2b67856
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10960 bytes
SHA-256: cfec2895480eb047cb09c3fab738d4ebdc0d3c2332dcadd8b417b013fe7247ea

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