Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ae64c4cb083193…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 11:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1da21c3c3ddd5bb0df230e2b45191706 SHA-1: b24a27226ea06298644422983337406d75f00b63 SHA-256: b2ae64c4cb08319333831a3d17483b28e528b4e1333b0e2ea1d226c26b846cdc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://tattica.byespresso.com/app/webroot/files/upload/files/dejolidawife.pdf In PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/9916124558.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rabarovodag.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zisigarozitazis.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/42457347938.pdfIn PDF document text
    • http://elsped.hu/files/file/madanutug.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/54736176914.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/46745524427.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/87317478639.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/bamiseruwo.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/pebovikaneb.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d470e4feed---matapeniwusisibabup.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6b42e7177482817a99caddee997e3e1d/xogusadogovi.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/80748938348.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/kopen.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/87500132018.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/23325244858.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/52660634920.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/wetuzif.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/lifamek.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bsacpeot4c84glt8kdv5cltrim/7553491601.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/73241460049.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/10465222158.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/65692783748.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nusoratakiborikedili.pdfIn PDF document text
    • https://isleo.com/i_photos/file/13426641710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+art+of+attack+in+chess+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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 10724 bytes
SHA-256: 44003a8088ca8ec3c2f339fe46a8536fa94fa14d63248b2db2864c60cc784ee8
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 16508 bytes
SHA-256: d485e15d76ce42f901bd0f4a6adcf4d101c57f0987a4d711f2c93b14f97fda60
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1