Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f84669c91871b6…

MALICIOUS

PDF

106.8 KB Created: 2021-07-26 05:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29ca8f52731610f3481e38a7a2893003 SHA-1: d18fd504f763638f42336fa39e58c1b71b8600ee SHA-256: f5f84669c91871b679e0f0aecd0f54c2975c019c61687b6fe2ed472e1285efc0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alexandrapanayotou.com/web/images/static/file/tevogilukopevipufewelo.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7703b01b---zulekaxekipupil.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5cddb98399---1348250128.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/40a9f710f70b91c9d31d8f417229ddf7/fixolesidi.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e8266e6ed3900781464f664be47b1429/bajebutugenodiku.pdf
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/3813941531.pdf
    • http://rocb-ap.org/file_media/file_image/file/41997964645.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cecc6559589---43173786495.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2fdd6bcf3---sejoxa.pdf
    • http://ahlhy.com/uploads/file/080309097370.pdf
    • http://amandamaitland.com/images/file/gofutegidomokikani.pdf
    • http://ned.ru/uploads/files/zidisuzene.pdf
    • https://hosrem.org.vn/ckfinder/userfiles/files/56323929869.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0kiofshco5e9sege12kps0f77v/napawepekatowuduxokazud.pdf
    • https://mangonebike.com/uploads/file/62289683632.pdf
    • http://verkaufs-akademie.com/userfiles/file/lorizupusasikarodopiki.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8crnes7qdg29qgfubi9hkmri9v/17739974729.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/o4gmlff2vbpchb2oqdhajb74fi/mefonaxotadazukowiwez.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9db348dc84---gerejafegozekifag.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v175fjkb06avk77arbis0d7no8/wotegexepikejusipok.pdf
    • http://massageindex.nl/images/uploads/muvekulikilulow.pdf
    • http://davcpundri.com/css/file/84210592615.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=solution+cube+escape+paradox+chapitre+1
    • 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_off00013a4b.bin
6c72bf1f2569331da4b4783fdb60f54351ec1bbf20ec7bcca33c3f6920fd0ea0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 18660 bytes
font_01_sfnt_off00016a67.bin
af79b638bcb8e9855343688369193a89e46fdc3abd9dda811378de450c730ada
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A67 11080 bytes
font_02_sfnt_off000183fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x183FC 16792 bytes