Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb05e225459e1fde…

MALICIOUS

PDF

89.0 KB Created: 2021-09-11 01:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cea9711f2e659aaa6318b952f2d4385d SHA-1: bd4d05cf8cde8310da06556f531c7cecc4203c50 SHA-256: cb05e225459e1fdea752c3bd028ef6e5be92f2ce1a56f7920a2edfdcb222245e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://dambi.pl/userfiles/file/99974700712.pdf In PDF document text
    • http://studiozoppini.com/userfiles/files/bunabonukatukowozirop.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/18077417289.pdfIn PDF document text
    • http://linza-market.ru/upload/files/navunumanowof.pdfIn PDF document text
    • http://dlzj.net/upload/files/202109080315393722.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/nagijubiful.pdfIn PDF document text
    • http://gewald.ru/content/Files/tigofateliw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa2d7ba93.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/65239548600.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/vudoruwofiretudi.pdfIn PDF document text
    • http://decorstore.eu/upload/file/78943790635.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/32514382426.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/parabirupisamujakagipala.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcb00b4ad---1948221202.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3679aef4ad8e404b5580f116d401b4d8/52734891155.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/nemafosikinalivavidad.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/83803628115.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1dfc20c3---kajogoxodikixekakopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wolfwalkers+watch+onlinePDF 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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 19564 bytes
SHA-256: bbd4aee724cc0df138d01c1f50854b69018d7fbebccc19e4d232454296cbc39a
font_01_sfnt_off00012654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12654 10604 bytes
SHA-256: d5cd4f0a08d430f4a310a489d64332a0b2c5f9d1a614c5a3d77ee17c63495f90
font_02_sfnt_off00013e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.