Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbe97c2999bb39d…

MALICIOUS

PDF

101.8 KB Created: 2021-09-08 01:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de0f25f31cc820e19688cbcd429d959e SHA-1: 5d0637dee4b18fbf9b92377b038ffae9596a0952 SHA-256: 0fbe97c2999bb39d542369517d223ca0846f97e4ba6382c8bcb39717232d097f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://immsac.pe/sgi_userfiles/userfiles/files/sejevurulub.pdf In PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/janusaveburob.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbdd425d49---56472215122.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0cf3b4eabede279d7f5f37ac8df01bcd/11665185524.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/tavabafawogevo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a408f4d1a16---xikamiliposovuvirimumilav.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41513751c---xuboxagadojinotagawar.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/77084108475.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/9571195959.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/bm6hrjntme8rqcv4r003a8vj36/bunozaxopog.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/de307a5ce84034bbd58ae7dde5f26243/63417350681.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/87c8cc697fca657011340baa6b9844dc/81264094118.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/xavaxowesesup.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3c24d79781f2c58b2ebfbc77fb26cdd6/jivonojubuwep.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a08ad54002---41060941287.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16091faa12f539---63917695519.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/90813228999.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/194db885b9fe89713a4643ec9d9bee81/woboxirozuwopagubavumu.pdfIn PDF document text
    • http://asustainable.com/global/file/78202386476.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210828230206.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6989f0c0e---lonuwu.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/sumesu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210601010838.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/moxiduwepek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=expert+secrets+free+pdfPDF 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_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 19336 bytes
SHA-256: 5a8cec0bc495c0f6a12fc602acefe28c25d2c3b15f3909b6dc7e06500da48938
font_01_sfnt_off00015ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C9 10176 bytes
SHA-256: b077d9705feaa907120f4c94e82a78e4d3da3580d656dbbe52d0c0d69a2e754c