Malicious PDF — malware analysis report

Static analysis result for SHA-256 3052e426fbc2bfbe…

MALICIOUS

PDF

82.6 KB Created: 2021-08-04 19:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b13476cb530a19206dd069f6df1accd2 SHA-1: b8eb88e09b1e21cfe1051cdf16a1565f1ba1bb5d SHA-256: 3052e426fbc2bfbefe8e8a212557fcbd8b68ad4c77cb000c7c5246e68fb20ea2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a lure to download further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b187eaf9d---suxuviza.pdf In PDF document text
    • http://designbeginnings.com/upload/file/xaxonubeva.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5b0d1455---tafidutomamutokoretulirid.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/voserexatuwuv.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59127bcfc---68181865838.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/765d014701873e1705b46ee45d7005fc/53945341568.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9de8a15ee1ab85068f37fdc052984e4d/remisibivulipumusikuzo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/285ddf794446f440e0e76db6fad4f98c/45408824792.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c24ccc523fa098c2dc247be5abd5db4f/57497494969.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/putererila.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/85998190142.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cj4l9u5ol4gr4pdljlqh7upr87/zirufavawukovolopules.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/jadiv.pdfIn PDF document text
    • http://rjt1.org/upload/files/mamazapejitofuvojiji.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021625415589578.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16095b917c77f4---mijuvelaxasopov.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/51987647361.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/negodogudexavesegoparular.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/13043261978.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0b0edb69e8427081eb4c8b7a495e976d/43336561654.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d47decc9d27---wevimerudebanejanewi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f36072799b4b68d8230e37e54d31546b/25851619924.pdfIn PDF document text
    • http://midel.me/userfiles/file/riruxibubew.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/siwebigeriraso.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c127b90393f24dce37a288300e038ec0/morafozimunapene.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/nizarekubolositezotiro.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/wamudixego.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-4/20210804124632342119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=excel+community+medicine+book+pdf+free+downloadPDF 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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 17452 bytes
SHA-256: 0045cfaa59e2796089dbcc123df9d54d7a9c53bb6833d3935255342bf254d225
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 11232 bytes
SHA-256: 2d182a0034b492bf05585cb58363176e0abcfc33b39bf5f76b19b604c4524939