Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37f69b73a8e95a5…

MALICIOUS

PDF

82.4 KB Created: 2021-06-12 08:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bf8d7a1839b8ba5aca742f5f2da5429b SHA-1: 006549684270514c0cea09f3e77302507044561a SHA-256: b37f69b73a8e95a52bb8bd7c58fa25e66e1b75424d56014b8413209c35bad8f8
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 phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted from this sample, but the presence of external links and the overall structure strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8227

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://chcial.ru/uplcv?utm_term=7th+standard+english+medium+tamil+book PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b963b850---82893730405.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i161oh7c6eiheh5thigl7kflv7/64113085835.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/warorevatuvidesokikobe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af938d38ae---jitupexali.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/260aea802f09227e4995ccd0e9252533/79018325780.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c56dac30b---65985082918.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4361bc8bd5---lawisesep.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/26741288970.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/adc6d95065eaa92fd4815447785261df/dixonolarunabikoxezi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9d145effd6103f8b6745b8e8c5d5a762/66949342764.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/2398158940.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf544c458a---votenazebajan.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_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 5428 bytes
SHA-256: e45d4bc78068c11047403b7d7b435a49343df5cbfa9451a35b769557766b52df

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