Malicious PDF — malware analysis report

Static analysis result for SHA-256 36584928b270b2bc…

MALICIOUS

PDF

40.7 KB Created: 2021-06-13 19:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93979ed924a85490cfe0c62688fc2181 SHA-1: 66a4113c2b041e8ff4a35049080136cdc2826d23 SHA-256: 36584928b270b2bc34c6feaa8162be3b8fb04652c861bc89ba6110c248beff5d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8008

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=compatible+devices+for+fortnite+mobile PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68dd907f86---rapevit.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/mireleko.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a2048c4e1072c0123da16dbf076ad96b/88344223120.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9b39dd95c6165aaa190a0f3fdc4b255a/xapozepilipujupej.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16094ee919f953---bifizugomisevudola.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5415da314f---rerafakulubinijefam.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-29/images/files/nisotazapozawakaminunugip.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jubujigelim.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mn2603el8uop716kpobv3ebc16/80499072643.pdfIn PDF document text
    • https://medtek.vn/storage/file/xosadetilo.pdfIn PDF document text
    • http://ligneus.hu/upload/file/9468513884.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8715dd070---jelerirexobodutoru.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/301325194478.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nepugimusufa.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kigepigemivi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b358aeb68---30251789301.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/51055a4e8c2d8b6736c45aa699f02672/bevivo.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/19850439007.pdfIn PDF document text

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