Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4074411db4a09e9…

MALICIOUS

PDF

88.9 KB Created: 2021-07-14 04:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30544b2c78ecbe259fe808c53cc4b6ae SHA-1: e7122404189235fa03d61cc74a2f57f23f6ce4c1 SHA-256: d4074411db4a09e9be9653e0d7d3611965eae109d6ba3fbbc4ab562f6023cb2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=java+spring+preauthorize PDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864d23181d8---jokunigogebadesaje.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804ad007985---23971513210.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/78585275807.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/46ad84b180e73b392f408f4f250a8daa/polixugamozajaguwagula.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/va03k2geev2plik3h7039bh0l0/56678115079.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/48719317898.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/h7pg92kpuh2rtl53d9mm4l5p2c/72685994500.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/14673352253.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160767d3688932---sivezufesusew.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/jirepabibetotirefaza.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/somipukutozam.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/2477122743.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/076ffa589d9eb39f72dedfe222a1a2a9/vijilomupamudawis.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a0dca1616---38565661716.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ufis5tf8k0dea8dbcuom3rgic8/mogabasitegupepa.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/17647033096.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xasebezaxupularoxusebu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7ff5a8d81c2f9640b129f7a2d86d31f8/45866683595.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2878fc4e---gukibalufawumufapaxeme.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075de12a2313---76086113843.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6cf5d5619---93636871821.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/42018381698.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ba2cfaf3d9ddecc1648656321c9d11e5/wixaralunovutonoz.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/57907717702.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/67989326886.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_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 18268 bytes
SHA-256: 89166fbbbe1f625f5784d917578c281ebd899b8bf686c5c30afb426830aa34fc
font_02_sfnt_off00013c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0D 10700 bytes
SHA-256: ae023a343b75730fd9216f2c5c504349dd6bb89c077bec41cdebd6ed126592f0

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