Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1aec6eedb8ab6a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 16:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8ab31672f556f7d5e6dedbd88672139 SHA-1: 8095fba130eda566ebf30107e9a42617bddeb829 SHA-256: 7b1aec6eedb8ab6ae239a97469d20f792f690a825e7579fb1eec5c9d18394fb3
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, likely to host malicious content or redirect users. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick the user into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609daec05f447---47474790938.pdf In PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/28082194325.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/90015249573.pdfIn PDF document text
    • https://sainaudit.mn/File/52881152674.pdfIn PDF document text
    • https://bem-sa.com/img/file/65786512108.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/edd6d025442a05fcac81a5bd284de61f/kikewo.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/ronemowafeno.pdfIn PDF document text
    • http://123dvere.sk/files/file/89111562005.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///72931919711.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/62435298075.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/zudubidal.pdfIn PDF document text
    • https://tempegaring.com/contents//files/15829996399.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/90546059326.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa27499df---12710889076.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pinelebetelibosafi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d540b8b0c---87541968697.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/78412457803.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/luzufev.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kupujal.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/bajagus.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c35161c30---1928194043.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ccf576a8f950592bd01f8567714bf91b/lafuto.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/79587435239.pdfIn PDF document text
    • http://platcometals.com/images/file/gobivo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228792f27d---12736881698.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160939b0df2688---nimukobodunupifizisidozik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=therapy+online+a+practical+guide+pdfPDF link annotation
    • 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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 10908 bytes
SHA-256: 89837cf16aeca1940aa25497310a475fa8dce08e13fa9f016ad23a2f219555e9
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 17412 bytes
SHA-256: 1f25db89d142fe538f7fa2372ffa88cbcbebb647e82a6aa456c5aab719d1c147
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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