Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b6e631ea9e38aa…

MALICIOUS

PDF

107.5 KB Created: 2021-08-11 05:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f4c6eb76214eacf5a2e06100043cbb6 SHA-1: a17573f37668225c3450cd2d45e4538bfc6dccac SHA-256: e2b6e631ea9e38aa38c617f1ce48aee201b4d6ec47c223fd74754be52e52d161
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically using invoice or payment language to entice users. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57558c6d4---fasepiroresewemeji.pdf In PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fukij.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4decdca6b---31289632852.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/taxopimokupako.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/28237270979.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7a92d6aaaedc2f3e8469fba5238907be/wugoxesutalopurukafe.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1706f972---83726847701.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/60521583313.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/kugunonepaliwi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce56dcd8e8---11941177177.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00a6c12d6c---25703048195.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/wejuroposamafivu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tuvafosojikezamuwegotaket.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7b60b2ae4---9631954670.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/60465778473.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/efts64pu8uhv9g5hb462tgodr5/vofadumoferibexanoko.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88774e25---46512919724.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/wupopote.pdfIn PDF document text
    • https://chp-travel.ir/data/file/82273124580.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610789eed6b48---30707189698.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/zovuxusexagelabaz.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ofb3r12i7449ohoib8i6a315c0/34146669215.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca15b82bc4---90440410982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=como+me+registro+en+el+club+terpelPDF 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_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 10824 bytes
SHA-256: 49c8b228f15ce2b0a9eb0bf86c427ea3d33831019d97526bdace20ccee0d03e2
font_01_sfnt_off000154b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B3 19244 bytes
SHA-256: b1582fed07c926461898c8046b4ba85d0c26570989e8252ce87434b1884e8fef
font_02_sfnt_off0001854b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1854B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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