Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddf10276b6097f2…

MALICIOUS

PDF

62.4 KB Created: 2021-06-23 04:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b5f5fc0fdddecac0c60981164b849154 SHA-1: 2c70ba9c80ad1d3dd8d37ad9a1ee417054b0a48d SHA-256: dddf10276b6097f2594b1d078467a7cff10826de7d717bca7a23063b9624b72a
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8079

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://allytemp.ru/uplcv?utm_term=fifty+shade+of+grey+read+online PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2b662997a0e356b33fb028528ed457d0/49409089033.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/joqae44186fo12vmv9len9adss/89845802636.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hbcl5sd7sraup4tfpi4aab5v5l/sarujesile.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/nivixixutapuvepugaju.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/52471796780.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/64352565192.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527012214.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f213348dd---32529909551.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/86049444063.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/14276933886.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/sisokelipikabexetofa.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/wapunawavepuzabobetopu.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/fijilifu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/18705927206.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/53630889634.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wadiloboperofewum.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2eb31b019ac33be7d9ac39d006b25f8b/23227072696.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad14b881d---jogemubudomunovenixozemo.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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 5224 bytes
SHA-256: f3df2e166e3ebba87f9b6270f47efde5c688310ad5987890a4953819dea3329d

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