Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17805a57e6c9f8b…

MALICIOUS

PDF

65.1 KB Created: 2021-09-25 15:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4aab58bfd8c63b794155eabc451a7bab SHA-1: 83a4eaddddc89fe9ef07bbbdee3f35ed5106a9ea SHA-256: f17805a57e6c9f8babf73d7ee054b80cef4d1c27149dcc96fce860278a1ecb83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm and potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs, particularly those hosted on compromised CMS uploads and disposable domains, indicate an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5271

Heuristics 5

  • 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
  • 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://portalinmobiliario24.com/uploades/fckeditorfile/78021920919.pdf In PDF document text
    • https://wonwon.taipei/photo/file/82742757366.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ponigepu.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/40963344339.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69310416804.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/53498291784.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/42496529394.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/kepadupolon.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/lojerovefuzutubolab.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/xepiwelu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c75ec17d---8416829811.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/sisurazuroxigowina.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/21814668970.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/98060255247.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131482f7f0ec---80704788715.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/ridupevukoba.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/wuvutux.pdfIn PDF document text
    • http://ossokahve.com/upload/file/65900873046.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/86699375674.pdfIn PDF document text
    • https://expomediainc.com/upload/file/xiwulobukugexuwaresapa.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepulafumitafimetixej.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/pelulisigexogenipoze.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613371ac7bae2---49209616134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=font+online+free+copy+and+pastePDF link annotation
    • 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_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 10704 bytes
SHA-256: 08712d36e9233a7fa1e9910c332c70055e33e126ee8806f532d9be0ce3f0d533
font_02_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 14300 bytes
SHA-256: f32ef6232058c3147a2c7cda6c03f181bb030648b1a7d83babd6163630d16888

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