Malicious PDF — malware analysis report

Static analysis result for SHA-256 d440448065558932…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 13:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14d30972a4e5eaa231d5ab4618246e83 SHA-1: 99f812ac041ea1a6bb914793855229953ad288f7 SHA-256: d440448065558932cf291d5a23ebe857d3a82c4a2acf01b2842d9e1feacaad8a
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8389

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://lecourbe.dk/userfiles/file/94796144167.pdf In PDF document text
    • http://bhartiyambeohari.in/userfiles/file/49980367662.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/favunuxedigefe.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/28190772533.pdfIn PDF document text
    • http://gnox.vn/upload/files/ditefobuzevoludala.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/6451609253.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zetuxe.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/3784084392.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/70608466794.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090800040171333.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aa49t6vlbde54jslt42qo0vg1u/giwofu.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/9992307723.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/pofafovoxaz.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161342bb7158b6---losibegowanedakix.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/29896192941.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/76380625312.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f847ad01c5---ratanetazudidajekupiba.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b1308b604cca50e3899c616094e80621/71934663767.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133497001f84---sobosesuvo.pdfIn PDF document text
    • https://casaalu.com/luutru/files/40706644797.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219820439.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413dce0e6c4---39436125098.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/34620255397.pdfIn PDF document text
    • http://industrialdevices.in/uploads/54356006627.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/75038773012.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/67145017624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mismatchsenderid+fcm+androidPDF 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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 23596 bytes
SHA-256: 668077e2007f46f1e4ecad229e0d7e78f05a1704206db519bb7538182a12eec9
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1