Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87037df3366683a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 22:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82f88aef0ef5f285c5db4b94ec481674 SHA-1: 5c6bf37de2bd025efd4e50d2cbfc9f387490c99c SHA-256: c87037df3366683a8f1fa4b94a590bacad07f794d174bbf1d8f6a784af11bd26
124 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4795

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://butyfarm.mm520.net/userfiles/files/jutodanuzadesodozakujolo.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5388e84a96---sixemori.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b8cd92602---44173591003.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/76345474431.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/mokuzotodopijenazaxiriz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6866dbcdd8---80323303251.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/safitotawomisu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608632866706d---rowuzujexe.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/67466896847.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/88205213803.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0e4dd2c03175981cbb5fcd1cc6a2b2f1/66730930127.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943434657ca---kifipuzosajovulepe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9bcd035cf---96604757225.pdfIn PDF document text
    • https://2acontractor.it/images/file/38527102916.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/wiveronavisafunozuke.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/37315488687.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/45991920671.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9u2qh3fvhpgms7sfsvuebg815e/sizosuvutidaka.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/65244253943.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/tutowideguredezojupatari.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/zemilifomukivomeno.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a87kdflsdiabg55nv8snaht5c4/19685691095.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/subigonedijibabokozox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dictionnaire+de+rimes+rap+pdfPDF link annotation
    • 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_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10736 bytes
SHA-256: 665dde3ce2086bd4baf75b67437f8a0247b206708fe05921d81f47cd8c6df69d
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 21444 bytes
SHA-256: 40e1753892e0317f4f73b48341e10b584da8a860e4163580b70d4472328b5b26

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