Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bec2a071abe875…

MALICIOUS

PDF

99.2 KB Created: 2021-09-04 10:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d96dd1266009029b42af998267892d81 SHA-1: 3801f2b2b0ffeb906d3e207a6547c66e37a1db14 SHA-256: f6bec2a071abe875eb7fd9ee816a2f208b3ea3a6941493700e878ee6e677639c
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution campaign. The document's structure and numerous external links point towards a social-engineering attack designed to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://tese.in/ckfinder/userfiles/files/lunuzilobuzag.pdf In PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6c8524548b31444fcd6a124afb28befb/rugug.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/mevowetikukojazolukoka.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85635630468.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1a48ffdebb9afd59552f4afc402b69b3/wekeberofo.pdfIn PDF document text
    • http://carbonelite.ru/file/nujulavefejop.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d049ababd932a183e57fab6d9dcafb96/zetosikin.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/1298563556.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210815031955_1010366541.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/xazojexe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5a02d9e63b87bb83c99af03f1be7f260/48347139338.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/penizowitusudu.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/31495485330.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///bijimaxokarewegubup.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/zedifevuk.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4eo69ucjgg3gh4abnvi1lcq1q4/68925564464.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/80107328769.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab5db1791a---paxupaxo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/92885832c142395ed2f8c85f081bd12d/pukigil.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb09f264732---kabaleziwewu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7daaf413---50415255430.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/60554563590.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iemucrqek2nh364cr04vuv4gc9/rumavulanug.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3955ef2a---bebepagitibu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bezifipizosuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=soal+dinamika+rotasi+dan+kesetimbangan+benda+tegar+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_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 18616 bytes
SHA-256: 439595eef024c247cf94eeb59182ac61c142b4485a98dab49a156821a30ff52b
font_02_sfnt_off000164ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164AB 11148 bytes
SHA-256: 79c68a71905538941fae6f6d9a151984e46e04ed5d2f0950818002b4113b2ae9

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