Malicious PDF — malware analysis report

Static analysis result for SHA-256 d897f729b76333f2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 20:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac55443ede9ae3b4254a2924ae0e9479 SHA-1: d880e2e5900b0044a2b4ecf7c533df4f71167f69 SHA-256: d897f729b76333f2373238f133f5ff8bdb7274e8abe83defbef965150da4b239
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://garglob.ru/uplcv?utm_term=top+gear+us+special+watch+online+free PDF link annotation
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/14188495174.pdfIn PDF document text
    • http://npas.ru/pic/file/38876354083.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/dividedurosijaze.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/wafinifepofodojetotoxew.pdfIn PDF document text
    • http://baove24h.org/upload/files/69779097090.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/tiwugafa.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/39227609757.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/83876211465.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cd6703617844e0a71bf6e0a51fd6e679/detutobujafuzojeg.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/11299919213.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/61733642816.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/59960860788.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/meruxetosezemunuvo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e17b5217---13559599348.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614077e77bd9d---pigaxokojitezepuvagalitez.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142019ec059e---8076501407.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/rosagukufimoxobusikin.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/74444198083.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/neret.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/96622973128.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/6598253796.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/kemuraginopatemav.pdfIn PDF document text
    • 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_off0000b51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 10908 bytes
SHA-256: 3c9617f26c4198eba43d7eea5f90f05ff09644c2c029674c075a8438c48f9fd4
font_02_sfnt_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 15672 bytes
SHA-256: 4e79de2f8b19a30cf5153f7c046488908fa31f7543efa604ed7736a749bba141

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