Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb37d6d73941a732…

MALICIOUS

PDF

84.3 KB Created: 2021-08-19 16:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 10348d4ba1062623fe3924812bb17de9 SHA-1: 84c7092abe1e3ac25c62b4136a7296ded8a5d42f SHA-256: fb37d6d73941a732482bbab8570255adf6173e2bb6d18777bc14f0a919e894d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous PDFs on compromised WordPress sites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The embedded URLs point to these compromised sites, suggesting an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7b85b7d15---sawijokexafon.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fe197c07a---69722788129.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a9a9b89fbaa689309478815f5a66230e/murojef.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ee517b30c---95740617349.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/deff317b1314b2900c301f89a6a28dff/suxolugixozap.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa03692ab---93766446319.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/nkn6uj5cqstaqsvp16f0kbi0f1/mezakenijodekuwup.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0e8055a9---40830011059.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160df4b00310cc---7565726785.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/17898212690.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/77891816697.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/82f94daa8d6892b28a8ec8d0e0e9f057/tunudenexewedopobo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/xaxunalifanerijenetaz.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5cc1ba624---fivijuwifenoluwegubipoga.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083874d1c126---nadoropibemamodogogodesel.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/16f9bd7879fb72d0fa910904b589f9d5/73681117900.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b54a2e06d---49773523918.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/65773102015.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c8fe9224ff00c362df0016605dceeda1/jonazutu.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/gopuligumomibimud.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078334896981---99187715487.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/37936447167.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc803e3aa---rexoloxibodilowo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/i7nph28nicu770c1f3hhltjb40/wozulesivexizet.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/90ea3014a48bbffa7ef1a25c19253a84/17781374707.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/lavivelili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+calculus+and+vectors+harder+than+advanced+functionsPDF 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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 16752 bytes
SHA-256: dafbd94ca5c5e186df092878eb9c8d973f84f50bbbf19c9783d4a5ef8bcb1c3e
font_01_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 10692 bytes
SHA-256: d254bbeab53ec6923308ce28b71ad0639f5c7f6774d028ecdfb0d77695372950

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