Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cba0c610dc6ae9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 01:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5fa74897b17dc3741312aa9358212a7 SHA-1: dd36ba1cd7af67206e8b6e00c483d489026e8c12 SHA-256: f6cba0c610dc6ae97e94b96f3f2fcd109cec75d81ee9573bf60ad5766f5fc759
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to various PDF files hosted on compromised websites and disposable domains. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing a browser extension or update, a common social-engineering tactic for malware delivery or credential theft. The embedded JavaScript may be used to facilitate this process or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=how+to+delete+pages+from+pdf+in+adobe+reader+xi PDF link annotation
    • http://partner-support.net/user_data/userfiles/files/wafuranenififolomabover.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202108231513236112.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160851c0cedb13---povojebij.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097245c1c4f7---pibul.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c89a1bcf---popamopexopogite.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe7b5b863---siriwonerojudufoxabasola.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/257996458.pdfIn PDF document text
    • http://abpaluso.com/upload/file/58966569207.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a4005fc70bd113e29d16d3cb14d85385/75450876730.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/dagiboxogimusu.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/xajufo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/rezulotolu.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/62951599863.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/22887724343.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/subobikofanewujegudime.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f689e810283---46712224351.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/10932984886.pdfIn PDF document text
    • http://elskenecologie.nl/files/diropidulunot.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/62187386267.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/74639846836.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621064791.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/ranowoxevifebodivel.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7b22b1103143bcfd194f593e83103408/jinujisumukatake.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/mogotenunawazumog.pdfIn PDF document text
    • 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_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 11160 bytes
SHA-256: d428ad863290feb7e34bf4b7f278718f8baa8a6a3df2605fcbf823e027f52d8f
font_02_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 17608 bytes
SHA-256: 5e22d0e19f80e3137bba8285d9a28cd24e70f487c1a20ceb5e093c30b9bc708c

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