Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e101f3e342baef…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 13:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68946666ea7eee71e05752cc3fe4071a SHA-1: c4f0e2f8de33ede03f08a8124a4104aef2ae9caa SHA-256: e9e101f3e342baef511a2ea4fb568954dd577c97f88c70ea2b23afb12e44ca1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dzbnf.com/upload/file///36708634773.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135d98215cff---41759556335.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/62250105114.pdfIn PDF document text
    • http://jfe.hk/userfiles/vomokinokunopitegiz.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/sowupanumusupafuxipu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/47539874201.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/besagugusot.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/51388566940.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/71413221752.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/guponevovawulodurogozov.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagorazakexosivatuxarak.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/wubiponikufeperutu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///85323500750.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/71696828970.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/lupugej.pdfIn PDF document text
    • http://selidbe-beograd.info/files/31338146864.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tefevutu.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/60408939592.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9b19de19c6457255e61fa8ea58433198/tizizivaxojetalawinuw.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161373a63d2262---jikixa.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/bakumup.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/nevamunusuvorozu.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/6904473491.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/32160991005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=windows+8+simulator+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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 10900 bytes
SHA-256: dace9dbcf07b8d8ee0939404efe8377e27c2359d5d1f085a7969d38dff397fdc
font_01_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 19164 bytes
SHA-256: 7eee774a367a8b84169626e412d5c4a9043469478c7404d0f9240237fa7a0c5e
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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