Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdd753c9e472ea7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 14:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43c479f52c4c6cc7a006082714ea4823 SHA-1: be15ac84c77c3811a7f2388445368b8ec81d0fb2 SHA-256: 8fdd753c9e472ea75cc2c816ccfe4d8fe8e184e19a588b5079589476939b7aeb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f9130d16---92371894961.pdf In PDF document text
    • https://armature.ir/cache/fck_files/file/mudupide.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/45323941816.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/23924348570.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/gemikumuzogulo.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/bepoxife.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/bubolajafuno.pdfIn PDF document text
    • http://cabini.it/userfiles/files/34501495130.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/26306175788.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36132355921.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/xozubamativujakor.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/detikafasukemo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee9b8d7e6---vejidosadozowib.pdfIn PDF document text
    • https://redac.ch/upload/15586206360.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/dibaxoliz.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/tazakopalawilivevejekabu.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/marulizoxakimilofanisa.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e19f09c92e2852f107901b4d97b5fa44/xawusufivina.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109111901416442.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c288de975---datudujetupefad.pdfIn PDF document text
    • https://satesayap.com/contents/files/fasupalipanozo.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/tomixebazilofijikidimuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ninja+raiders+mod+apkPDF 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_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 19476 bytes
SHA-256: da83eaa393d08a557247e9d6c79695b4d85f90b79e9f6c0c06995416d636a27f
font_01_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 10608 bytes
SHA-256: 9733ff6f088193f416775f74a8068c771df66cf6296d722095e810fd38dd64c5