Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e8b84f67415ccd…

MALICIOUS

PDF

69.3 KB Created: 2021-09-22 17:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 358c5f8e0f865f35e6645c24dc0cbceb SHA-1: b35eb11a871cb5c00797fcae512e42c8db953bb2 SHA-256: 04e8b84f67415ccdea52a7c807a9516431bc6039889069ab4f1789f24bc696d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=multi+language+support+in+android PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/av5v2pf3t5dqn0ot505sl0rp8g/34989959379.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/tazawupezusijewizatuki.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/vuninitir.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/sasoxiwowodevopefatiraba.pdfIn PDF document text
    • http://julianina.dk/upload/file/zavamowebow.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/89102378709.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/25677912688.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/83258228368.pdfIn PDF document text
    • http://home-plast.ru/foto/files/29464838782.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/97455343151.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109192316244246.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/rewesekunuvaviduvakagej.pdfIn PDF document text
    • http://agro-partner.com/Image/files/xemixubavufomituxakog.pdfIn PDF document text
    • http://ux-school.ru/files/files/97302016241.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e9ee38959---kiwoxogadamolit.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/46132154178.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d3a6fac4b2d51747f13de2419262afbd/89037753067.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144e458384ce---wafuforuxukekiva.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/4821124133.pdfIn PDF document text
    • http://thevalleytrader.com/files/77106792559.pdfIn PDF document text
    • http://hidropro.hu/upload/85792065029.pdfIn PDF document text
    • https://mkart.it/uploads/file/29002143418.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/4314892259.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/88712853856.pdfIn PDF document text
    • 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_off0000b299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB299 10660 bytes
SHA-256: bc0b7af412bcae9fb938c054303fbe51e7ab23188eecabb92c27ea6a70112a5c
font_01_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 14508 bytes
SHA-256: 7870baba925b0ed2d64c9e71d1c92bd47fd1ed3235f052d0d9471324c351d8a2
font_02_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1