Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbd87e2f7e41a72…

MALICIOUS

PDF

111.7 KB Created: 2021-07-29 19:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b61774d5de029f6728b4c089499bd7c SHA-1: 2be16e8dcce06b01db9eb4afa685ba56b92cef7d SHA-256: 6dbd87e2f7e41a72ee189d81330929264787fd6bc7ca83e0b2414ee827153548
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed a link farm structure within the PDF, with numerous URLs pointing to compromised WordPress sites. These links are likely designed to redirect users to phishing pages or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4618

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://sdds.be/userfiles/file/6159463975.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828bbd091b---numevoxubowaladopolozam.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/80993553533.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a2f5ci32fb4e8rs6mc9dq2bm3a/71982500064.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebb28313a---12808017142.pdfIn PDF document text
    • https://migger.dk/userimages/file/89664314565.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0bf88019958895f044a635f1c1a210a2/17983037258.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pabonamawopuwol.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ace32e78a---41052519094.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4g200brref44d9tca5mc1rso3c/guxojulatiweresive.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160881b0ae43a3---33966838133.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/mipifademawopu.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217132327182997.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/776ae2a7f3af22f98d8f5871203eb944/36262793507.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/37779473808.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5fd37634f---kulikelakederazaroxa.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/23bp02qm2e93ephhpn8hjfcvsq/65422721667.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/mifex.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/judalopevafin.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/petop.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/l57af8hmjm0m9loraugmt71k53/vuselawemozevejexobotigos.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608711825157d---simadipotexowikolizeroviv.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/buvadoginimizedubiroz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd271f1e8a5---bogemolitemeduso.pdfIn PDF document text
    • http://didula.com/img/file/23825374890.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/digomibagogurir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=boom+beach+base+builder+game+runningPDF 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_off000169af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169AF 16436 bytes
SHA-256: c37178892c861234b5c43daa3867ea72067c18b8f03b9054c919e3ea65bc529a
font_01_sfnt_off00018036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18036 11012 bytes
SHA-256: 7ac0af8b606ad51318e51137aca6a31750b3a499d90e2a69ff793d77e5fdc28b