Malicious PDF — malware analysis report

Static analysis result for SHA-256 5096a03148e0c1e1…

MALICIOUS

PDF

82.8 KB Created: 2021-06-17 15:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a6776c740dbbbe0f1fc2740775e2c711 SHA-1: aa1c7af2211e886e69e47e62af4a7205ea816e10 SHA-256: 5096a03148e0c1e18a6bc3f35c335e07d0e6a67d70ad6e2ad6bf6362a9aee527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae109a5b3bd---malonaxakobetojajar.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d13e38918---57180752211.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/bsglldr7es7tla49uemnr86sm6/talel.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/3400087947.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8271038e---16070201830.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/navebobekebabanisibu.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/42522349908.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2c022204---muguxobolawog.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e234d8e0b8c2c7176407da273ccc4a43/11682581715.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/nenotizabojewaniraxifixip.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/fatepedisinobezu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/62024579977.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dbb3e53ce---25301430326.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5dfd535ef---kijugadukudomunoku.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2018+macbook+pro+battery+capacityPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 6168 bytes
SHA-256: d841e6ee9fc5f8d88f1d94419f2a0f587508a927e8deb92e2b18ca34c352e48a
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 5600 bytes
SHA-256: a22fb31aee83206177a61a1e3e6e4dc95c213245ea6616762c96ce7864d7c107
font_02_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 11060 bytes
SHA-256: 628d9719d32d98119c82a4ba3ca825d7a970e98a39f9a6319b14a1dcd77ec538