Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef79f09ce1855df…

MALICIOUS

PDF

98.2 KB Created: 2021-09-04 10:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e5e8850bb72f2359a80b25d1058dfad SHA-1: 86a33e99f548a3593218f559f511590cc1bada55 SHA-256: 8ef79f09ce1855dfe28228b12e200e58aec8334208b9ca735e2ff9b6e43b40a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The primary attack pattern involves luring users to external sites via a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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
  • 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 http://mehmetrasimmutlu.com/icerik/file/roninapan.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1d39eada0---mizuzimuwomosebe.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c65a26ae---92407983326.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/50917042239.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/piziwav.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c087c21023---pazebirefuzed.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c4ffaddc21c942738ca3312a7001c14a/16122611898.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd273b2db2---75608559750.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b561c256d9b1511824540e54c68059b5/nunepomotorodum.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ba76fe53---91861389974.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/76695274845.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/8017815879.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/nemurujilum.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/25322204592.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/78534002463.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/54436292617.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/58450007084.pdfIn PDF document text
    • http://kfbi.ru/content/file/lixujejaboxawe.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0571049dd---nubor.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/96228576989.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/negeziju.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e439f25e---70953730792.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f4ac5659---55175369804.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/gefiwoguwuwes.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/temogugekirenixexebuzodiv.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/54599183162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tratamiento+de+cardiomegalia+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_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 10756 bytes
SHA-256: 12b7d80799341d6fe68aa961e156903e8a35c72176d3fd87ab4e3a547155d7b2
font_02_sfnt_off00014834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14834 20000 bytes
SHA-256: 374f7629b09ac263428146326cfcb244e489ee0439ada9cb52dce03034fb4478

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