Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6855dc292175f73…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 00:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7ce0de7da4f0fc97f32e16c077df8d3 SHA-1: 33681f85d5be7eb00ef8c9d289d5dfd49c1e45d4 SHA-256: c6855dc292175f73badbde30cd79b183af468867491f9a67c9c2b7cf98bb0fdd
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains that appear to be compromised or disposable, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure suggests a malicious intent to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://tcremich.lu/files/files/regagufekag.pdf In PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/keguwubojamisezawovojemep.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c3aa682b---9459960818.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/mobujadugiwem.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/96649055995.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fbbc2f8c22fedf73d7cdf5110c8250aa/80237616342.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/30670090120.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/67779343381.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pupivinowanad.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17e5b23a2---28413859231.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/kewupodulagopifitixi.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/30713133025.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/89630818901.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/10758760087.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705c28cf6---wewedutubelowupupipeba.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/983141e0662ff90712e9ffa7b5bf7630/vapijonadojarakufumabe.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210830035149.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/sulimatisevu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/25333446050.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6ba76448277d2b17c1febec7eaa15925/zemutarifuxafokevuzox.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/bagatakigugeguz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/005a853981d3226bf869aec01943f08f/70184977457.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nefefuriki.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/pakida.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/dowedetigamimet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=word+usage+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_off0000b50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 10424 bytes
SHA-256: e5d84f6f120baf0b9402511778a6d2771d5f6e4393a0d6a1f5fa9d647a8e2467
font_02_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 16052 bytes
SHA-256: ccaecb9f2562c8f231cdf5accad7020fd2f1ffa026f03bdafaf67b3f1f64ccc1

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