Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e3281ab3b62705…

MALICIOUS

PDF

77.6 KB Created: 2021-10-06 08:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf5908c7fab42cf850a3968e7207c6af SHA-1: 5400cad2bb8bc3e72fdba0fb2fb8d1043a24c345 SHA-256: 30e3281ab3b62705004e555a9535d367ad91903c2e6e0d1d40bcb8ca917e5735
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports malicious intent, likely for obfuscation or exploitation. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dar-tom.pl/userfiles/file/59468573987.pdf In PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/japerediva.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/15153780180.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6ba9d74f1107d5db6077086d38a7d832/xupufuwuwavokewub.pdfIn PDF document text
    • https://mklaassen.nl/images/file/63646142826.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/rujojiligef.pdfIn PDF document text
    • http://villkasz.hu/editor_up/74845239734.pdfIn PDF document text
    • http://vkts.se/userfiles/file/divaninonufeme.pdfIn PDF document text
    • https://cardolf.ro/files/mubazusigopefar.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/36801441890.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/36012309168.pdfIn PDF document text
    • http://ossokahve.com/upload/file/vupobewalinobobamikawud.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jegomalalidasukazo.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/wanigixalizifax.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/68679653061.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613df41847025---jufixukisu.pdfIn PDF document text
    • http://chpcentre.com/files/file/26978200718.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/ribanote.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/23018998587.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/januwozegonizuritejidov.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bd0094c56---23399512162.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/mujizalekofederosevi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1cea27b0---tolewuxepukumaresulepoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=decay+in+tagalogPDF 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_off0000ca28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 18340 bytes
SHA-256: d564c0481d04c57d576403b2dc8b2539ba62a589f44941284331c3853efe299c
font_02_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 10252 bytes
SHA-256: 7d618eed8eee909ab8a7c08cc7f7489ff40fcb718489d6c298a4b7eeca2496b5

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