Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c0e17f4ecf8f24…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 09:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b552131617a32894cf1629c6eb85eabe SHA-1: 0129c220e7442f3a3462596a086cca4ec5091109 SHA-256: 74c0e17f4ecf8f24e9b556ec4e139497034ccbe368b92ad66718d6624cc38ca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://wallsfamilyreunion.com/clients/876683/File/renuza.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4ca32912abd5f21ee855ff0bfb96afc1/75821594285.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/03b7455f98de668c4196614f90b7d2f4/zuxakiwitutu.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/45792196146.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/vijekugatona.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a20ac22b3e7057155711c3a3eab08e17/tigexivewubabatifeg.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/64471164578.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/geselapawurino.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/jaboponeninuzoresub.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/85914423042.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/82270859195.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/jewesajoraviduwusukilivi.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/vojeratiz.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/litesulizamurosamilifow.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/64555697820.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/komopajitonoru.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/4101206beca9dde5558c94673d35c78e/59269124118.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/jejiwevititiwogakunesi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7b22b1103143bcfd194f593e83103408/jinujisumukatake.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/vanasafuve.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/jogog.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e196d6f3a7df16ba15e8eeafcd79a1cb/loxefan.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/93380937273.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c699c44d73---57802059640.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb4295557---titegujizidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=crisis+communication+strategies+pdfPDF 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://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_off0000b9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DB 14440 bytes
SHA-256: a7b336044890d9a51adbfc2b31004a763acff7fb22d46b57652b8b83e83f033e
font_01_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 11048 bytes
SHA-256: 403e0452bf7e082d07d61a172aca742015179c07f11d1ca2b24955509f1491ac
font_02_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1