Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ba54ce2e4fa865…

MALICIOUS

PDF

110.4 KB Created: 2021-07-06 10:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a8dfd8ce00847badd2a957c0fd7c376f SHA-1: d7c7e75d4b760d5a9abafcf091ad1681e2f06b91 SHA-256: 51ba54ce2e4fa865cb46d3d4471b73a6ed0f4ca9bd22e8f51df7677de425506f
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a payment redirection lure and a ML classifier. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host and distribute malicious files. The primary purpose appears to be to trick users into downloading further malicious content by impersonating financial transaction updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ec156765830f4714612a74af61c53de2/tezojuzaropokowolujazu.pdf In PDF document text
    • http://agiusfuneraldirectors.com/files/file/mezoxezoditu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4cdc3174---sapez.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/iqdqm6pbf5rpkoc36usqjpb317/rugijadebuko.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c496134ef67e4a719798587655b683f/rodawon.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0c3ea873a57c48afb437684aadfd048e/totipuxuven.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6578c162---regoxava.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/78417468698.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/zalifolubupisojameli.pdfIn PDF document text
    • https://chptravel.ir/data/file/83262531364.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5fc6880b160f0f2eaf15ea260cbac876/28461069142.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc30580e8d---13466828453.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71e41e28b---wujaxidukitezofolajutukit.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/84fc0851026b261a39d321763e89d0c6/88418706683.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/46226236063.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/viwatesevabofirupote.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/872b626ae10d8bb2e0956286ebb213cd/fidoduxo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab389e0a6af---6991654607.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607412559ee77---limatowewukaxizapop.pdfIn PDF document text
    • http://kodemari.info/data/files/zuparaxivolifuvimifuritos.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8e696c1c---tibadetutivupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=march+new+month+quotesPDF 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_off000150b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B0 16656 bytes
SHA-256: 24476c9afe80448c664557bd4b1945a8084d491896cad8125c8dfb988a582d25
font_01_sfnt_off00017c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19417 10684 bytes
SHA-256: eef9a8f53421c84786d55cbb1bd2d03b4c9b5adac6b193ce7a49c47cc38fe37e

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