Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4a590c6dfddeb8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 06:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6497fa873fb6fcee3f509f142e82e977 SHA-1: 3c331cec542afc35417179feaeae958fba4e2647 SHA-256: be4a590c6dfddeb8e8390e2fe309b43c26ef350008dad76694b9c5dcf1499c88
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple links to external resources, many of which are hosted on compromised websites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for phishing or malware delivery. The embedded JavaScript, though not fully detailed, is a common vector for executing malicious actions, such as downloading further payloads or exploiting vulnerabilities. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/uh9v7sjkt8ej48tutd4qaosf8d/subenasurijo.pdf In PDF document text
    • http://tehla.eu/userfiles/file/dawibeweratuzidujuwob.pdfIn PDF document text
    • http://anpo.vn/upload/files/lepidefamowufowafog.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/lujenopa.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/33579308925.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/36562368542.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe2d6eb1d---79672070046.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/64208370028.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jojolal.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/fidixifimatataxeletaxox.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/towuludobejemurowogope.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/68071170284.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/gepasuwunudabitex.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc50596161---wapajukilitadizoruzom.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s23rt34e2b371879fl3114j8t1/zulosanupimanaladokovanib.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea510acec---goloxuzesafi.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/13541258919.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/85111343627.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/jazomaxatovo.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/66777933230.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/80196286446.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/burepeginejefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=beely+lyrics+app+mod+apkPDF 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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 17956 bytes
SHA-256: 906924e83ffde3b80728228c4a5732c78976ef944323b572485e105ba8e12d80
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 10732 bytes
SHA-256: 94c82bba37772b5067fc58f1f2e7eaef990c9ee3e1cf9484d397d9d7aa065729

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