Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d9840039f6712f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 20:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 623b770f2467b6b1cf2af88a048470b8 SHA-1: 50559426047439907613b2b39062d21145622c83 SHA-256: 17d9840039f6712f65bd0510f4d8c84338e93a3ef79607ac13dbadee990fe380
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links pointing to compromised WordPress upload directories suggests it's designed to redirect users to malicious sites or phishing content. The primary attack pattern involves leveraging a link farm hosted on compromised infrastructure to distribute its payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb143cc7b---34939363859.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd2d2c62d---buziwaletijezuw.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdcd05d80---finerijurosaweripifefir.pdf
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/97024336004.pdf
    • http://ezibra.pl/upload//file/boxatelexuzelaje.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/98869601545.pdf
    • http://schs1968.com/clients/861610/File/5388942170.pdf
    • https://getracemirates.com/userfiles/files/40545086732.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0b515a6e317299cf787c27c2559b4f32/78298372518.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/86438374672.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f5719d02---neguzivugow.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/67597589663.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/wifuxumamudedele.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/db6ebface3c85da0f8d90e9c9ca730e3/vovotomemukajipeluvuviw.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e793b99d5d---72596915396.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0d1349e95418c14a7361adc3161ab396/73070467743.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608643807999a---77335973379.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d1496610---gakefur.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/165jeu4a6823j5h185i1v1co8v/66099892641.pdf
    • https://noihoithanhtuan.com/media/ftp/file/9812155819.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/52754968220.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb62ac65e---bapisuvegomatirivavap.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nd8i4b32jjo6khfg1raa1dinu1/wopuj.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/03ed92b96a7831cfa3c9cb1f4bc62b4a/94825907395.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+put+multiple+video+clips+on+one+screen+imovie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec44.bin
80615fd91718c1e4f08190621bc5bd1d57e3ab00e2c4694ae2f90d99b766159a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 17108 bytes
font_01_sfnt_off000118db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 16792 bytes
font_02_sfnt_off000130f2.bin
72b73ff33292772f4a6250fd9ca8eb75e03fedd18323879735eeb8aee5f3c0df
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 10756 bytes