Malicious PDF — malware analysis report

Static analysis result for SHA-256 828795df540ee2a9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 12:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3178e9e92e6e2789a6fdf0d023644d0e SHA-1: 72664d5c940130f57f3eb9ebab07a5642b0e6b62 SHA-256: 828795df540ee2a93a314a422cc21f2c1e12cf963bccab9867fdb4d0f3658ee1
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a link farm pointing to compromised CMS uploads and potentially malicious PDFs. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's intent is to trick the user into installing malicious software or extensions. No scripts were extracted, but the presence of multiple URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://galgalesh.com/userfiles/file/jepusiv.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aad82acac0e---92885261926.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/96859025193.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3347442ec613bda8f097f41d21747919/fumukujitaxepesafir.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/69062347705.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fc2aa446---21231436852.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/i8je4l11vjt064csp74krj0eod/bebugifufinelivegilufot.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/19452893269.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/sukatumuzemet.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mixasuzafo.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/wonegukovefazun.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7b798ef5---24692662084.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/gurururebatejaxi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da0b18b6140---67332812256.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bde461a6---42155177750.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/68982857409.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6959ab0a2---gitovagunedomasul.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/2b8d89480ff03c0834ad175ae5488540/98064520939.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/316282523.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/96002290280.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/danetegaxenapuwepe.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29a5c785c---73567462061.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/guvisowilo.pdfIn PDF document text
    • http://beateromer.com/bilder/file/ganivasopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=emotive+language+worksheet+grade+5PDF 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_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 17820 bytes
SHA-256: 30fbec4a2af90f06080784a35a64c81e81dc4bd5021f5b756e2c343b15f681aa
font_01_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 11156 bytes
SHA-256: c9e9cfba24e1f907372b141271b1915b75d4bdfe708bb52bcf937547a5b5712f
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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