Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5bfa0169c9eed1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 19:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 236809208793c11e429ca16235bae871 SHA-1: 1e5679270ead77859b364590a1a17faa84dedd90 SHA-256: bc5bfa0169c9eed1fd6cd5d8a0fecad48ceb1973d3f15abdf2fe7eb173c297c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_URGENCY_LURE' indicates the document may contain deceptive language to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=std+9+gujarati+vyakaran+pdf PDF link annotation
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6oe320s4sgbo3g4s8sp7h4npo4/niwaxabig.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a85825f8a---8701436268.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/50691590035.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/27786005650.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/miluzuvivevutapofi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/funivumutub.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fopezajifil.pdfIn PDF document text
    • https://clinicscrm.com/img/files/wixubovetawonifemem.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/44039083602.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/gegosanopoduredami.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/71231817155.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/16376596875.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/15068820115.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/retaw.pdfIn PDF document text
    • http://newmob.it/userfiles/files/91995231623.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/lopatetogegukezorofenusod.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/giwiso.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/58605665043.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/86482519843.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/vujulopova.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210913_EC87D42956E05B96.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69143fe0d---palolejukotevukes.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/91392805445.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/60835394064.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/firatebizibiwokenoragata.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/23343002504.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_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 19748 bytes
SHA-256: e05cd590790979c56f3d0ee727a23cf293c3652cd2ba9d6f30b56936fc123c49
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 10952 bytes
SHA-256: 936701a99bb3936f76cf0ca94e240ea7a74998584627c84d898fb9be388dd43e