Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea9a17753909980…

MALICIOUS

PDF

69.5 KB Created: 2021-06-08 21:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 548d681f3f473a5ec10136c37e376c18 SHA-1: b7e4ea091e157511a65a7790358fde84f14f24b7 SHA-256: bea9a177539099805ae634adf3ef6c65fca71512d8a8da0df243e4bdaee292c7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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://krisoc.ru/uplcv?utm_term=most+beautiful+concert+band+pieces PDF link annotation
    • http://fautographie.org/images/userfiles/files/15077017843.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f362e3a72e---33477456774.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/us1g1vjvcl376i8ihud6cf0g15/17820007389.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/96f76a51f4c764ea43d6303e6e8808d3/61451023154.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/be8096193fe2202e0cdaa2a04001ba68/tuzujituredexoku.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j5hi9a73m4m09fth8ujkj2e152/puvojijisujupumes.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/50133512604.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/27625723490.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/76203079383.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22c4744a6---pulofevel.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c24974b51---50797594441.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/448dc9270504c1f78a93e1c4502a6d08/53287101295.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/55539242020.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606edf6539e67---31013146885.pdfIn PDF document text
    • https://tavio.ru/files/file/9864519341.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/23fb2818bdc1a923330f6fdede9756de/kuvefis.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 5292 bytes
SHA-256: ce636122f4614e4174663959c247e1b9c775bb15b8d3c2da478e37a9ecd64417

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