Malicious PDF — malware analysis report

Static analysis result for SHA-256 432c0cb378fd5a2c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 14:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 63eaed237d7bd5f1920bd886b22b4828 SHA-1: 5658bdf0bbb3078d14591569b5fa9b306c9695ff SHA-256: 432c0cb378fd5a2c77362a10ca155295c21909294f2cd97569cd64ed23d49a8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The presence of embedded JavaScript, flagged by heuristics, indicates potential for malicious scripting. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tikatalog.sk/_files/file/jelivofukigexowidemewoge.pdf In PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/dasixuzeji.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9394b9034---sapojijonexafuxixef.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/rezowur.pdfIn PDF document text
    • https://khanikango.in/file/batev.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/jaguxofopapepusatowapugem.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92300793994.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/24138250608.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/21656597018.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/jomipamuforokikotaxatex.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/34988581424.pdfIn PDF document text
    • http://wawa757.com/uploads/files/baruwozisudixi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/notoxoruxomag.pdfIn PDF document text
    • https://haidangpc.com/contents/files/15103470485.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1971af3b01afc0ac2be262798ba93c0/resozatalewisevajojemedo.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/22501915459.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417ff8ca6f---sobokajodekuxijidudo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161336ee0e950e---gunarug.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/jureguropawi.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/42321664956.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/79811894902.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/korinoxutabolitalog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mi+11+lite+5g+price+hkPDF 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_off0000bfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 21912 bytes
SHA-256: 786c394bd97e2d1be967ea1db90c7aa5f5d2d77d3365c65187c485d5655e179f
font_02_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 10368 bytes
SHA-256: 12a9cd4c55b9230426dfb91d7e51c46e5770bca86b68d42d6143a1b9aa9d5c78

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