Malicious PDF — malware analysis report

Static analysis result for SHA-256 85627521f1b5d78b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 10:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 19077a22c8c0e66438bb2ded65011e37 SHA-1: dce45bf5f6313ecbcf630c253a8d39297af088d9 SHA-256: 85627521f1b5d78ba01182cd3026cfcb8692fd8d5ce0d86be13eced292ed3184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://colantuono.it/userfiles/files/90063929571.pdf In PDF document text
    • http://ocung.net/img/files/naxajimukabefezefivad.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a779219840e2b7fd52f75e6e0cbf6d8c/93140860587.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82703f45d---24916589074.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/botixaduzazi.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/mezatetu.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/88569591238.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/vivopisa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/41174556634.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/libakuj.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/444eb9bd71df442ac3d167fb1d689199/78750808481.pdfIn PDF document text
    • https://sharenkon.com/files/92954335976.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091403305851.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9e12b3ee7d5dd76a0c2c7b1e94c02125/rabopumolexobawe.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/vixixoragituwizikigu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/17944409104.pdfIn PDF document text
    • https://advik.net/userfiles/file/wusevezukuzeg.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d09540c2bdd9f9e1f122559e21578737/75501624912.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/86887127913.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/24301226223.pdfIn PDF document text
    • http://gestioniarmatoriali.it/1843378733.pdfIn PDF document text
    • http://rrarental.org/upload/file/ximojebututexaleparuwajaj.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/61224334925.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/keforivax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=time+zone+app+androidPDF 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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 10264 bytes
SHA-256: 2a542e9c88970597ee130e9fe8d62a4ae4aadddc8c78631427c9d8a03021f36a
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16744 bytes
SHA-256: 4e478d491bc448779d38373a952a5cfbe157245dd159f121917a0b1ce759619c
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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