Malicious PDF — malware analysis report

Static analysis result for SHA-256 0487d399a7211d66…

MALICIOUS

PDF

72.4 KB Created: 2021-10-11 19:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f2a097be0ce2102a9a53ddb45437f354 SHA-1: b08efaef971c93915da7c529acf0fb9619d3912d SHA-256: 0487d399a7211d6668fc13f9af4a10f938535ffb7cf3c984f0012b1e31055ec2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://helicopterleasingservices.com/userfiles/files/39694892756.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/011lcm3j77l289m9t08dedecr5/watedivoviwuvuberubugojug.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/78628150491.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/newekugezunubinivinasona.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba8149b5ab---zowosagenegivug.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/66310590760.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/14233513650.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/82807087755.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/waduxe.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/27580170113.pdfIn PDF document text
    • https://samudra99.com/contents/files/radew.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/xajejilefiruviwofibakope.pdfIn PDF document text
    • http://elsped.hu/files/file/54606615122.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/lekomaduretomaforemalirig.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/pulidesim.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/60206560978.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/latepewovefowegoluv.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/mununigelogiviv.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210907_6F89557AD1B482CA.pdfIn PDF document text
    • http://strandedtattoo.com/file/vukibataverelimawor.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/wuwikamir.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/lubolufudenedufapafopam.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161394e749a669---lubuwegupifa.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/sewoxivomoturadusex.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210927164612636124tlsv1i.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/16358175421.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/zopaluvuzufewipu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=online+healing+servicesPDF 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_off0000bcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD8 10384 bytes
SHA-256: 2b7d0861df85e9ee0599ecec60ab3e4645ad1a0699ca59bd3f39d7798ba37d3f
font_01_sfnt_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 15824 bytes
SHA-256: 345826cdb7961e5eb966a8e1da550dc921d946016b595c5aa7b8ecece7d2c431