Malicious PDF — malware analysis report

Static analysis result for SHA-256 62402d75e940c3e0…

MALICIOUS

PDF

83.4 KB Created: 2021-08-25 09:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f47b0ec7c0812d5747a5f9a04707bb5a SHA-1: 62a0c594aae1411892a6334415feffe96684a4e5 SHA-256: 62402d75e940c3e09608228c6c321c8392a575725032ddafe65c2d31ca09e465
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to various external websites. Several of these URLs point to compromised CMS uploads or disposable domains, indicating a likely intent to host phishing content or distribute further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://pistant.ru/uplcv?utm_term=black+and+white+still+life+images PDF link annotation
    • https://endeligmandag.no/e-brev/data/div/42434943636.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ed7aceae4006e0132474a775a06abb9/71064793753.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/25231173228.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/130a4211f75f8f254b49a1d618bb48dd/34325893879.pdfIn PDF document text
    • http://tfforming.ru/d/files/lotixijasixolizozunuv.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ah86dh92t80rinacmq40vumas6/zuzim.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/basirebawijeje.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/82001411302.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e248386a5---22429956454.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae953f06b0---jifuz.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0bb0cd155---3863394806.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/lekebofijaluvujeselupe.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607032bf7acec---4341085739.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/23116854443.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8abd9262---topixejaborakimazipigeben.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/64517489325.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/25849726517.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/61053804276.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/5584e27050d3a54e947c272fc9e3a677/56306359301.pdfIn PDF document text
    • http://htwy.com/upload/file/41092234856.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97fa85093---vetoton.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48e915e8f---sufesow.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/75106327461.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/vifosawujiralugos.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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 17424 bytes
SHA-256: 373b57bbd00c4e5be5be3be5c1ab50d2e1e100970eabd58486e298923c38c65c
font_01_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 10936 bytes
SHA-256: 712dd41694e31c94ed67bfab8efde55dad14544055cc22c446723efbcb40e068

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