Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24e8cf2d5a16173…

MALICIOUS

PDF

78.1 KB Created: 2021-06-10 18:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b4dcf509442279b6fafba022ee02c300 SHA-1: 0cf864f22b9384e4b4fa9b003ffa29f85744fca3 SHA-256: d24e8cf2d5a1617315b01af91c5cf0f89acc89c2f9c0ed634d23ed67d99dffdc
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'hack hill climb racing for pc', likely a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8254

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://laborke.ru/uplcv?utm_term=hack+hill+climb+racing+for+pc PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/on1ln5656upee04sq6i8ikvb47/12996845872.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2ba80fef08ed0cbe88b4aa137f8b4be1/78778801258.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/dvs0a6mtb2lsg7a5vrje5cjedl/44351888919.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f4bffe58b50a90e625c298f63ee62d/peguv.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/84751907683.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721522f395e---defibumudewigutelabof.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/gozejukazaf.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d574ae13ab---xebanuxoxavogetexule.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5e37646d469460114d19612750862736/vexaxiditigemeji.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/eble59cicus3jn0i30kfqjn3nd/puwol.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b584e2217da---20409496647.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a08288709fb3cf03e9d00590d03060e5/64287683329.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/bofajuf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 5416 bytes
SHA-256: 5c03fd8cc6114c3bb479b6379b2960c50d32f77df0d7b4ecbff3cbae21dbadc4
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 3204 bytes
SHA-256: 5eca36ad3c3c36f06f50294b57f6d873aab95cd8f84033de276c5b9735bec20d
font_02_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 12236 bytes
SHA-256: 8fff5d3cbe74ea0e139906a65364fbdf4bb6d7ad3ed4f45feae2675d5a6f6bc6

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