Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ab34fbd9640d63…

MALICIOUS

PDF

94.3 KB Created: 2021-09-11 07:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb2115263df7d12b5c73d1077a362176 SHA-1: 0eef1ddfa81351c6a42ba119e95f4458a6cebb70 SHA-256: b4ab34fbd9640d63d88da90a43e50b8139d5314d984c34c681186da891bf54f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://philabc.ru/uplcv?utm_term=driven+k+bromberg+free+ebook+download PDF link annotation
    • http://iwort.de/userfiles/file/polavokezamo.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109041536578285.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16313111522826.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161328d277e56b---jewupidewerawufujer.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/gezugelodafafiseno.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b74b88a25---gamulajinazibokoxu.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/wemevevimemaxumewuregaz.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/puzufebemubopi.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/papojipifat.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/25163767382.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901105237_0prs5t.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/85175269675.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138000be304e---sojeduni.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/54226445438.pdfIn PDF document text
    • https://tessuno.com/upload/files/61353b932f095.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/reubj041trk8uqripsnuum338n/93458216624.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/zunavipe.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/93264962597.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/vofobuseluzabonulepise.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbtud5b694qudpg787j4lsoqh0/romazenozivinogigalisis.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/mumebetolob.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/jobiku.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/46151327063.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nanejaniliwakavape.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_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 18416 bytes
SHA-256: e6e4f709bc573350fd771c6f79f92a32e87e25a7b5653e434973750e54a849bd
font_02_sfnt_off0001529a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529A 10816 bytes
SHA-256: a206cca364930a6d6595209140a2c51404b0e30664eac1f085798e8ce2317d86

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