Malicious PDF — malware analysis report

Static analysis result for SHA-256 d178887109b9c6b9…

MALICIOUS

PDF

80.0 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: 4dcada157e834309128575b27389d865 SHA-1: 850d4284e04e4ee924216731b6903fcff76f151f SHA-256: d178887109b9c6b91567020c04df930d2bad673d6ea7a37f31e8c18fd7b24f6d
124 Risk Score

Malware Insights

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

The file is identified as a PDF containing a link farm, with multiple heuristics indicating its suspicious nature. The ClamAV detection and the presence of numerous external URIs pointing to potentially compromised or disposable hosting suggest a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2433

Heuristics 5

  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

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