Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b02b42b7217234c…

MALICIOUS

PDF

86.7 KB Created: 2021-08-15 22:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa484a5e5802aaf2d0ebaf6eb8fcdbd7 SHA-1: 9f6b1f8f64bcb9d3db38a6b98ba2514daed72073 SHA-256: 0b02b42b7217234c12085e15963a1cbfbdcf5c617cb94ed13e45ac0a9f16ffe1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=how+to+write+a+behaviour+management+plan PDF link annotation
    • http://houstontca.org/Content/uploads/files/pivukadidaw.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/xitogujajadone.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/banofanovoxogubi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebakewa.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/88421242349.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e388978b---87421813330.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/finenutuvemuvifedufuzu.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/texagokozerevapelar.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/66422449639.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/20811847353.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/bekuzofedutilafezufod.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ddaae6d67d3266f7367d6472800aaaae/mumunabubibijeketiwimej.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c014882473b---94086590255.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fkk02e2b6sdp63vp23cc8uk5d8/38214773737.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/79524196970.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7252dc69b03f513f61e4affd7e7642c5/wopoxarit.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b34ab80a4---40494839895.pdfIn PDF document text
    • https://777mto.com/contents//files/natevaxiwuj.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a75c17aff---28367343163.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xazarowira.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c3a75d83ec15894936fffa990b409d5b/19582091505.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/sujifedafufuvikikogapitiw.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/bef0ac0e4f45d134b780a71e3a715745/bigesijuda.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/guwanonadisekoweworaka.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/werexumowumivavigo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83aaa2077---33795519887.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/90763608777.pdfIn PDF document text
    • 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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10912 bytes
SHA-256: 9d1214ed4341b6c3e0e5f6020a3923f64e3badd55c0572cbd37dd4a56f1ccfd0
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16524 bytes
SHA-256: 546153ea985933508ab34a484878a90fbc0e968fef3614cb68da9e8b60e02de5