Malicious PDF — malware analysis report

Static analysis result for SHA-256 751e8fdb8da08b5c…

MALICIOUS

PDF

62.3 KB Created: 2021-07-04 03:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ccc2dcc8ec6cfe7e4a44cbd1cddac264 SHA-1: 475fb6afd4180d024e3eccc300cc164207267e51 SHA-256: 751e8fdb8da08b5c99c6589042d1774167b39667fb27a3e7130df66d63102d20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress upload locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6865

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://euinsuti.ro/app/webroot/files/userfiles/files/wenonejeles.pdf In PDF document text
    • https://grup-insaat.com/userfiles/file/bukebaxijagaj.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///pezefifarusapa.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/dtucre8ss0dv4ptaschbsh26r4/77099450225.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/fukat.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eaf805d0.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/18400568446.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/94ede8bf14c193f3c965dd6692e40ff8/66967128380.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098319a0461f---34673197485.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ba4962d1---jesewavilasedowagafeliwi.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5f8ea4b51357396f25f3298b7b024da4/nimogikobojemafizebid.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqi9j0do520dderv7js7qbv4p6/lavagoxozerovomajawiduf.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/gemuraposur.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da741653311---6573241955.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c6b05e67011dcd23bea34c39873b8fd7/22818972338.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c5f4320d---40262747035.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21ece18b2---tuzuzut.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/28916836703.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3be6d4f303acf863e92fe67cd9f29e6e/nabitikojulopelimabiso.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/52083457783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hot+naked+mothersPDF 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_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 10460 bytes
SHA-256: 68ee72ce5ba7037bedf9bc8776991a3b046301b9252065d32f1d231c696db57b
font_01_sfnt_off0000cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 16244 bytes
SHA-256: acfb741061fe358d3000f7e4874f0f1d6366ea5254e21fb5ec0fd41d1ba482d8

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