Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0259ead6f4b549…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 19:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a6e221d85b3c0aa5d977bc162b72509 SHA-1: d6150603d697f50515240441b7b19a8e1ad87e2e SHA-256: ce0259ead6f4b54937111dfc9b603a946691594f79e291d19dd843605a565580
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 domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=android+which+is+the+best+game+in+the+world PDF link annotation
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907074340679853.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/69040504970.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/petakotivinenilig.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/75822208060.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/19196609897.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/sugunazelidukodibog.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/78665470490.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/torar.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/jibob.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/kudaxejorusiruborokikipi.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a36a5b115c41b86c4ad74e1cffa65d67/5053913305.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/vesurutalog.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/vitozazezutam.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/34687668479.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/58501964528.pdfIn PDF document text
    • http://budropol.de/Upload/file/ninupabasa.pdfIn PDF document text
    • http://vizcsap.hu/files/file/15560365433.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/93761919646.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/41991008101.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/89232042484.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/87536793887.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/vaxijoviporopesexajoxinoj.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f89dc4f8---somenekase.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134c556a8535---nodobirulufina.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gekexosuzipaje.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/nadojirufenelo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2678e0b7a1c04ac830742e544748de94/9068954478.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_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 17312 bytes
SHA-256: d8c82d2e3fa174c2df3f729060c74a77774252a0fe108fff6f42b84987a33081
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 11024 bytes
SHA-256: 0f0dcd952aa694f4d9c86b307f2f1cbdde722df8eacd07b620b345e71feda79c
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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