Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca96332fb71661a9…

MALICIOUS

PDF

106.3 KB Created: 2021-06-24 19:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1d8ed1b6bd821b1a788c8528cecbd37b SHA-1: 971fba0b6df9d3d71fee273bc676afce5496ba11 SHA-256: ca96332fb71661a905c3af03f34e06b432e5a409757cc2bd9c540190d7306552
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8255

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://nomylo.ru/uplcv?utm_term=my+hero+academia+season+3+episode+49 PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff2ac01c27---78908060843.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3k7jhlac2a1l8nn86tucb1du97/bepakavodapufekaxegogo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6c9c63e1---borelof.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/34804939907.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ismmr5lr79iuq0nv71su50v622/90244075823.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/4605195711.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1e4aea04---rirutikuzurumuwodulipuru.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/91525011242.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc843790ce---jinamawiti.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03f7577a1---24466938015.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160926e92ea4dd---79144860285.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vj9aigeoi7hpg43iq724l14lau/dixugiwipiwidujog.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1eba527d---gevatanaza.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5660c4127117a9b9b32eabdbf111f4dd/70366672865.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/maravovufefuvi.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/49620526608.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/berelajimade.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/84302268740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00012885.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12885 35444 bytes
SHA-256: 708810bec029f04aba6cec5937762789c6a8e4cf949124ea0e6ecf13e1e5282e
font_01_sfnt_off00019719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19719 5504 bytes
SHA-256: b5bc20daa40e0d6321fa7fe49ac56077ec33ce7c02965e419496f26115fff009

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