Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1611c08088c27c8…

MALICIOUS

PDF

64.0 KB Created: 2021-06-10 06:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c0a52143d915f3b51bf878ed945efed5 SHA-1: 24cc6653bdb489f0ef8a5dabf3aa7c37295385c8 SHA-256: d1611c08088c27c8d543fa6c753d89680036003d2f9fc117d43bf09345a378f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains. These links likely lead to phishing pages or malware downloads, consistent with a malicious document designed to lure users into clicking on deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

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://wastran.ru/uplcv?utm_term=gateway+b2+workbook+answers PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/df9pcd2pg38mim6ad6d4kniicb/19892667617.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/gelirogusur.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vunelokosuluva.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/ladukas.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834753b1415---55476117693.pdfIn PDF document text
    • https://maturana.cl/upload/file/32401676283.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jisokavuwidemi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/90767467545.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8d31000d096cb5dfb905455561e4a2b7/fejodux.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/jumezekarebafalonujokomo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee0c75663---69285807784.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/p31p8onoepo0euua6al5ihjmj9/joferimu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84add1269---62619267851.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10bb6c0b1---26690804515.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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 5208 bytes
SHA-256: a21edc2a440b2c5a60529c3d83960dca105299ae6824a00fe009da06d91a8273

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