Malicious PDF — malware analysis report

Static analysis result for SHA-256 583b44307979e779…

MALICIOUS

PDF

70.6 KB Created: 2021-08-26 09:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6264fda928f5b7cefe538816473a3e7d SHA-1: ba169546e08ce0829015bcb3aa24e514e81a6929 SHA-256: 583b44307979e779af7987819236b6163a383fd7295900fe28bc855ffc1f059a
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely serving as a distribution point for malicious content. The embedded URLs and the heuristic findings of a 'link farm on disposable hosting' strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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://ketchas.ru/uplcv?utm_term=puritanism+in+scarlet+letter PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0c64531c---15680589093.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb740787206---zifexafiralixuroj.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee62dcbcc30---ganamogudedesafonubasuse.pdfIn PDF document text
    • http://usagimatur.com/files/others/fodigapuximotiruxajamot.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070815220673499.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/jazumuxukofudaperalavo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa283e54da---70889645210.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2db9b04b35---wiruxufejode.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/tidod.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6cb6b032---vimebolakizilegunab.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/ketomiruga.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c57686926a9---39549426838.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/gofojar.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cea0e11a0---zigujubowologalafo.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xajuwamiluxutidigosov.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dn7vugf64nr76bl4dc0f7t283j/wazurawilewutum.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/40507256338.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/velelamidodadi.pdfIn PDF document text
    • http://funperm.ru/content/file/tafilidenub.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/buvad.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/xubipuwagefe.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/54505605334.pdfIn PDF document text
    • http://taiwangallant.com/uploads//files/202108091328587275.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 10372 bytes
SHA-256: 83e28617b917790dd9fb9c65e16af4f31d95450d7fcf1b7ba1eeaae515fac45c