Malicious PDF — malware analysis report

Static analysis result for SHA-256 03575ead29d22cbb…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 10:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5a72a7afc85da11c6fd47b4caab3f4a8 SHA-1: 566d87812fea73048132d53e1d77d8a368514a96 SHA-256: 03575ead29d22cbb6b94fb023b3c007cd1ee690f2e71ff8e2eee39a4a01576dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The PDF structure and embedded links suggest it's part of a campaign to distribute further malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8beca1b2d8509fe0c84c9a87ae2b7fcf/47549740463.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gr10koq01i0faau37fga3kp5m1/35146521040.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8c7ec0f2---kitorowufox.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/787fa67e647053f54afe5e377b7ecebe/16293332509.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb697b529d6---wodiriminutaragolosejin.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/dobobifozip.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/83fb32b0323f9d2b3730f59f822b1a4e/35398915296.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gogugezuwimepides.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/kowagolizefumogoguzaw.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/xogaduwaxopipugorirutoxad.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zadatevonewel.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4dcee18d160f5bc0a579f765c2b86aa2/74431953992.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/cr165sljf417saso5r2373dld6/57003670795.pdfIn PDF document text
    • http://charivne.info/images/file/bevorigerefogeja.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/liwewewifesuxujive.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/butem.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5cd7eb9f0ba1ff9ba225f5158816bce0/27057851230.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c74b8abb4cc39bd5f9bbb02f9724ded5/dirapomirugamukola.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/273be2d6fb3f7fba67b6dffeda3f2760/90372746018.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/56227865354.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4881f28fcbb53584386e85f9231e45ba/62629722197.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050214331854.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b944a109b43---53296486343.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3543e79a---pepujapoloxenus.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/tifabolozeroxiboxupif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=give+up+on+synonymPDF 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_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 10324 bytes
SHA-256: 63bece0d7b8d9d51f9cf8ccfa3c80d35ac5af32494a02ef4bbd96a30ea9683c7
font_02_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 18336 bytes
SHA-256: 47abce953ab52286e8203f71e1ce0185cabf6c1178d217749eb1cddd3b7d284d