Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea420f654961b7c7…

MALICIOUS

PDF

76.3 KB Created: 2021-08-29 04:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d5fe66fbecf3291e9e6d53438c62db9 SHA-1: ac97d02b235f2847952a8043a737e0d8992d2709 SHA-256: ea420f654961b7c7417e77d4ce7d7b62b287cfe3c75703c1c946b127c10257bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=overboard+two+by+two PDF link annotation
    • https://yepsell.com/userfiles/files/45623642685.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/nuwonoruladovix.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xizarimo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160728ec1e0963---wesigosulumadajagi.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/87373717581.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f182565ba77---resifeno.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160913a2a4af9f---23779201310.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/16618674446.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b21bd36c---pexuzifujetod.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/luxipivorasodanox.pdfIn PDF document text
    • https://armenia4d.com/contents//files/98760929890.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/93110612688.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089066ba4a95---tisavebapazuj.pdfIn PDF document text
    • http://wenxuezj.com/images/File/gutolawotopibeduvuz.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160843cfb23a33---jaletewijobas.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/59480873440.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/fifatoguperakopelelu.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/modus.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd355a52b9---45270941097.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1159e55d68---jasafozex.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/55d64a918c0b39a807dcb312e42c2261/sevuxuk.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/satawusaburedasaja.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2062fbe828be5ab1d1638504909ceb2b/96017581778.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/37ln9dcc0rjqkucgtj851cnppj/deketavelimobiv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a680faba94b---musonilekezir.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_off0000c851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 10260 bytes
SHA-256: 93241b857198abf9325e2da96e5bfe437cf34912bc9b7709a0ae512e1dbe6793
font_02_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 16720 bytes
SHA-256: da9fe57345d91f08c5c2c8810ab6365ec30367ce27615867d23ad8b8bf0a7b0f

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