Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db268531d518b4e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 14:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 136d24c4fff50955f6363e9ee7ca7a86 SHA-1: 255f573cfb4f97e039b2cde9c99f6f2106b827f5 SHA-256: 7db268531d518b4e8fa605e62b979d9d51d157ac187320826b12983112fb9b2c
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 ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing malicious software by posing as a necessary browser update or extension. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest it's part of a phishing campaign, likely leading to further compromise.

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://it-hair.com/userfiles/dugukubejawofanolesi.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/85503935879.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/75240150138.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154a1675b3---46139612721.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/21559691186.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210910_B423A51C5DB8F3CF.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/45714006380.pdfIn PDF document text
    • https://wildnaturetravel.com/File/5792298540.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/36282854368.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/51105555381.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/xepodu.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/13269253932.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/zelasisomapibididunep.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9dafce74484535105441cd421ab854d4/fezeveg.pdfIn PDF document text
    • http://fruitsad.pl/images/file/mavisaxedokirefaf.pdfIn PDF document text
    • http://marketingnews.fr/images/file/firaluxumeruravifak.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/werozuxeligesugikobikil.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/93376934687.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/21329891655.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/234b1un57d8mhmdtc57l89ao4b/nagerusaridabebusesefud.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/31205631213.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/jeretomedekuxisigokef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=power+rangers+dino+charge+rumble+mod+apk+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 11280 bytes
SHA-256: f5bec60f1fdec31a8c11b87b824d0746a144dc8dcc208790b36a961e40d46041
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 19968 bytes
SHA-256: a47b75aaa8610cba952c7755e87940405866f351e7c8b5729f000c8d300ab051

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