Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ab8225350780f4…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 08:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ffa8fbf056e9c485d9dcde06af8d2975 SHA-1: 131b798306ca9828e867b695ebe650cf68c932ed SHA-256: 26ab8225350780f4c41abb01e2170810bb25f95bd26c67ee0bcea41c96bc8a71
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vietnaminsight.biz/ckfinder/userfiles/files/jufesidepejiwedofomolob.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/748d5fd3cb500390897463ebcd7a8e9b/34753041917.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/zosogoxejosad.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nawamopagile.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ui3sq1qgg0h0dh4sprp584p975/womoguvobogisoja.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/xerofikopofo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dk9vi80gbgg0oi1cc3faabfrn6/8951376381.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/bufigogipumumavakimiw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b625b2a3a5b---82740584683.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/46462110794.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa309d618---25491676199.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/752931987.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kvs99c21u76c6hjsp64b6c3o8p/sipaletonisupababomo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a096cad6d99e55ad06920827ef3e9961/50395667341.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/33509747242.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/xedurufijojakirel.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/65413745497.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c668f62ef5d2e84aa6e0ce43709c7f98/9791740422.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/fusufoduto.pdfIn PDF document text
    • http://beiks.info/public/file/diwivejozimidebiwejoz.pdfIn PDF document text
    • https://dhesient.com/media/gamupuzafoluvazefopiva.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vubifog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=to+sell+is+human+book+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://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_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 18260 bytes
SHA-256: abe7766a8be9e01e0bdc2bd01e2cd76889c44f5d2251715828ec75cbc9dcfa7b
font_01_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 10860 bytes
SHA-256: 94f1a16fbcf4cc03ee23a399a1402a7f3529da10f63604b43cc9340391b31f8e
font_02_sfnt_off000142d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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