Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b151424d95e6d04…

MALICIOUS

PDF

74.7 KB Created: 2021-07-23 01:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ea91bf64dc126ba26b210930bd5454b SHA-1: 44e4cf4fe5ff5415da895de8f08b6b233fd98e02 SHA-256: 6b151424d95e6d04b6f8cff111e738bf3aebabdcd95407df5f075c426f78874a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d2ee26c529d93572873374588b7f1d09/neratatiwitapozofito.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/5554074030.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/nidenim.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072c005a639e---15461404572.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///81078545597.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062012132380554.pdfIn PDF document text
    • https://castel.ro/userfiles/file/10601248047.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/23575289582.pdfIn PDF document text
    • http://ruresept.ru/files/file/rexifobaxototakulezi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/rakaxonotejikoli.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9c5012hq1uj6its6au9v8lds5/xumilediju.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fa0ecd3d---tonitugufigonorawifujatix.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/jofiwupalotepenujuve.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f9c6147f917df4a78a51b65047242a78/muledumevaxozelixefetiba.pdfIn PDF document text
    • http://enewind.com/pliki/file/86412953679.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/dudejuriwixivok.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/81334133479.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/bijomebez.pdfIn PDF document text
    • https://hgb.se/filer/file/jegozu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0ee0b7fd---desedigepune.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55924178609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nitish+singhania+art+and+culturePDF 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_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 10608 bytes
SHA-256: 1a2aa1f0913a99bbd12ff168e618d3005a3337def26ecd06c3e74b339196cab3
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 17032 bytes
SHA-256: da19f8e680b023eab491dbb5eae4222e26089f87118693608ee4e8cf6194775a
font_02_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1