Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9535a98a62e0090…

MALICIOUS

PDF

84.7 KB Created: 2021-07-06 12:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 396b19a9c3a6aa3a9005f65d3e5ade91 SHA-1: f41405fe9cbe013305eb59b02663b9efa6c103eb SHA-256: a9535a98a62e0090938989c23b0d6d51b788a740ee4ead581976640400164d9a
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are part of this link farm, likely intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3798

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 https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/om2bi4bhempudi7ep7kir0nd93/nudulo.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6e75fe6b4557096cb724d6dcbf70022c/72433553455.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202163161525.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080809e6379e---27495475759.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685faafe2d---79451358231.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pukajixuradaf.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sugatasutet.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/xufefemarotamexiratanagug.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a9d318e941f30105d046d26263ede64c/32919023156.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/beposuramuvefagekipobo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80c5070709---vaxek.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/xajilabobidoveruvanuro.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/koradifuk.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b91f7242b---zugibewiwanopumudawir.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/07eeac9664e7585907bfeebb283c6c4b/jofisorilofebunikukonad.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/xabegukesaforosakap.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/88972251490.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/6895374513.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/q56c5rdugsoh7tt6864n78to6c/lafabusebuletarigon.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080165bdec25---55770170362.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ff97902cd---tamefak.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/70141282287.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9deca17b---lepukejonamupitinujuz.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d660e8499---62343444904.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i0lketq10u66fqdv8mp7thg09m/kenakadinigosiramijagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+one+ring+rpg+pdfPDF 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_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 17368 bytes
SHA-256: 79712f48ea6e51f5a39ff88c2cda61caf7834db891f7dae92a82021369710e8f
font_02_sfnt_off00013eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB3 10264 bytes
SHA-256: ff1478d9bdc7237cb08acdb8e89382c051e220e9ce28ac2d0945c3f14c732fa0

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