Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ba221c8aecdce9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 01:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a21925ac09388f7bdbb108705baa98c5 SHA-1: 6d698fd0de46377b46a3639d5c246c187366cde5 SHA-256: c6ba221c8aecdce9ab6e709f88b3e7e0bd243b28db9545b1785fa45154de713c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://landpas.pl/upload/file/48937141312.pdf In PDF document text
    • http://abwessex.com/uploads/files/faretidowupuw.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/38066682291.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/lojad.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o328toa0qhdib3ldbg559qq218/52938942162.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/94309125368.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/jofulon.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kedifavudigelexu.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/1970034832.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/nisibufojaram.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/49253574576.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e30c7eded6---vabomegafuxafovugalono.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/29184600079.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/69cgk16u5qd4h87igtefm4k1mi/ronolemidurexirejumesil.pdfIn PDF document text
    • https://corghialberti.it/file/27946843825.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/xewasoxaje.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iskokani3692bd6s853vthvv45/54151527952.pdfIn PDF document text
    • https://btegypt.comfile/numozokunotaribefaxu.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/wojokolepajelo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/adfd6ecf1e41ba6939f8e78a210f8667/lobesokesebifapef.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9faf0a39fd---2350199785.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/8971995764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grade+3+math+textbook+pdf+nelsonPDF 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_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 11216 bytes
SHA-256: 14d248820db45920d6212727845d42c86cff0db37c34d2939cc4b1f1c2e4f7ae
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 16360 bytes
SHA-256: 7b536d4e25f4d1497debd8450725abf7e9f05afe661b1e1e78accc1091a5c946
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1