Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec69b862789f1040…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 13:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1eb6b9c2c14a811ecc807e5c7fdc1aaf SHA-1: 613364731f748badc09bfca24dee514be1a104f5 SHA-256: ec69b862789f10406e0b80c072641caefeb48b73f6d0f8f20ded8601e0238ff4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, which is a common tactic for SEO poisoning or phishing. The presence of embedded URLs and the structure of the PDF suggest it is designed to exploit user trust and lead them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e52f0a21bd---disevafuxoja.pdf In PDF document text
    • http://utpcomp.ru/uploads/files/45898890921.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/13438591306.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0cf973ad4---59936640528.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043010282273499.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd1b682c05---89771249224.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b7488774794833418df6ece4e856487f/kadorasufu.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/raloxeviwigafapu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/12670396827.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/89176667298.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/38180602894.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/75bf5b9f8a52f5a963bdbccbea768cc2/82124279231.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/60108184760.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/61cc3ea11db30135fdcfe7e0074fa417/8297016768.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/47678614811.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/pusapapopow.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e9c4a950edc05753545b1c1aa7c9758f/60342849504.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/nisifepeteniga.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/66063129766.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/89788760759.pdfIn PDF document text
    • https://promise-land.com/upload/file/59634435755.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/34783841071.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/zimakowujixigil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2018+bmw+320i+manual+sedanPDF 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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 10996 bytes
SHA-256: 11225ae46d9b7a3b5d2fa5202930b2005085eb44b6e6778eecd53b89198623ac
font_02_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16804 bytes
SHA-256: 04970e676907a8e3f3d553777cad515481e9b73f4a1d310bf5f67c10087ff2bd

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