Malicious PDF — malware analysis report

Static analysis result for SHA-256 375c413532e39e0f…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 00:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e328ca5ed47a5a712a9a6294f98187a2 SHA-1: 9faed5614e5fe7809013cb0299a148c0ab7e8296 SHA-256: 375c413532e39e0febd15cf9ae3ca0be4ce6cf27156d62533915948b930e13c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to act as a lure. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=dexamethasone+mechanism+of+action+pdf PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a07ac7b71---tusomibu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/20f92d885f502b6214f87d59f21849b3/pisotivuxewufukunenekelo.pdfIn PDF document text
    • http://jngf.cn/files/file/61345765093.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/91703300332.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/kotovibepop.pdfIn PDF document text
    • http://rafaelokazakov.com/file/46799839503.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8efed090d0---jevutiwezatemoreguxe.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/52427815787.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/vuzopodokolomipoviluvov.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/n5r6ik66kt8ag0aobv96utqs02/58095529347.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/pureros.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f586e714a3622163644fc83642d3e5c5/77797093630.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba5fb96ca---detabulejumemirenewizu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e14efd4e---14176897734.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4b1d9a3f---fikegizosej.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/judupajogowutomovitigutet.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/62825604099.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/43987684429.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/mofodikokisa.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/8535978248.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/32767207971.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/66587439860.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 19268 bytes
SHA-256: fe0a4a03f5117a5a702c99d38eb44199e787b3a5da16cb709ce7b60ec5360ed8
font_02_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 10840 bytes
SHA-256: 924c847d01cacb470e6a18c7dede77b8324b58036d6a91a6924e93a8d5748a5a

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