Malicious PDF — malware analysis report

Static analysis result for SHA-256 658f0f5a352d68f5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-19 10:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4e08b6c4a9a71d12dcf00d6c8cdd5f92 SHA-1: d57fe21ee2ee6cbc2287d09b0eccd1b43bb5607e SHA-256: 658f0f5a352d68f5f862b0d53d1bb9c4315753810d687acacf7a9f3f00ff194b
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 0.9890

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://ascinfratech.com/clientprojects/trading/file/76658778994.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195dea6fe1---gatiwabakomik.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/kowavejufumasofipuro.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/doj6199sa460577v0l60ib0ksn/rokevirufegukegutimuga.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/5702777554.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/unecuiflqpbk0m7bfej6ba9abm/27643277538.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/17359286739.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d8d4db6e---9540969896.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/pagironotawubokojak.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/wemokafubigogodojo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/42v8oekgedhklnrd4av5f1ilt6/kixoxexu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3d41501d272475a8e1b5f687348a9817/vukiremosarobemuvisovos.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831d2f0a05---dokenekukefi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72872834cc---21539097291.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d2de33b9---49252716676.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5d408b4e---12117020738.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clicker+games+unblockedPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5368 bytes
SHA-256: 38ef2abb5fd006bf8748492cb48cbd09d5e9c0accd70bd956ed99a7135f9f69e
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 10704 bytes
SHA-256: 67a15ce0a298c72e762399dcba9751b05c063b382c1b8d7df86ba8d1bc1ba43b

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