Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba3b1f858b7037c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 17:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdd7ae99318b5aec61b1a78e7681841e SHA-1: 32d7a1bde3d48ae5ef872981deeccc6ad0f0964f SHA-256: bba3b1f858b7037cc8514dd074fb9f5dcffe2dc98138872e02bc922ab229950b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress upload directories and disposable hosting. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=orruk+battletome+pdf PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ec375452---gaxirigam.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/62325260688.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/96058194575.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b539658257---jopefuwulus.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/kuxirimomuga.pdfIn PDF document text
    • https://megashina24.ru/files/files/85923330041.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/96751387400.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/xesasamufujul.pdfIn PDF document text
    • http://bdsductri.com/upload/files/geluvu.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/xuvesolixulexab.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7n6itg3idqavhn0duc2quh4f44/pewimuf.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/1224780475.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/jezolefaxamoladasef.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/60222600259.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06ba35d67---vawatafizowupinagegubo.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/14071683241.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/19346389889.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/sekisa.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/86273803066.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378740d8385---fezisiwewatoku.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614105b5cd51e---vewerovokoleturi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa6d0348f---5220094729.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/38190638194.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_off0000afc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC6 10652 bytes
SHA-256: 98b11bd26cb623143eba1f5582a3b0f8d4ce9e029350c06c70e50e16edaf7977
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 14860 bytes
SHA-256: a3db0dfe2b8b04ee3fbf2abf42552020052d2200eb3ab739571af8075649afe5
font_02_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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