Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea02116c777239e5…

MALICIOUS

PDF

77.9 KB Created: 2021-08-21 01:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbf9e9dda13906deb467811414ce595c SHA-1: ed0eeb0ffe4b9b9d4ccc005d5882f564cbfa2f97 SHA-256: ea02116c777239e54d80707a4c43ac0a455449a7ba4ed2a0d18416e28235fa88
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://animalscipublisher.com/files/upfiles/file/nifinekeginoze.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f7c3cc7b---sebenis.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/mirujoz.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842cf6906fc---pegepixapoduzefelu.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/kometurojo.pdfIn PDF document text
    • http://klpa.net/userData/board/file/36943348798.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/1368723316.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/403e8b615ba742d86656fe7cbb5dbcab/8785930434.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/77754741440.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c0b86317d52e06eaa60989c107a1c740/zelosazudiwapibi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb2afbf030---lanumipapober.pdfIn PDF document text
    • http://pneusmarene.it/images/file/duzuxenusuzuz.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7be428f6---71983052296.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nelaxarotomika.pdfIn PDF document text
    • https://yuss.it/file/notofugufunuwonovebur.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/16342663077.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607938ca5a672---dodaxaxutuzom.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/gewowigur.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/aecaf62d2a399c0aed9ce9e95f6f2273/43111403164.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kodagin.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/lusifi.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/40642919217.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/22436046842.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9b322991---33656776583.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/tujezut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=runa+vimochana+ganesha+stotram+mp3+free+downloadPDF 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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 16400 bytes
SHA-256: 53b4b3a11e78e9ed14d90695dffa230863174680c3aa4d53c9f8caf45a5b1563
font_01_sfnt_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 11536 bytes
SHA-256: 03c3f991e6d997b3ada6a8b9903998c9a2e133d09386297fd042a08f7d195cbc

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