Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51c2e9dd764e558…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 04:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0af01bf249ca52e0ce891a36eeb735ba SHA-1: 1640d0eca8cebc1b81262640f90e93bdbfee3c67 SHA-256: e51c2e9dd764e558d3094402224f2e9c0e0dce6cc3e2a08a02d636bd4eec9bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0ee517c84420e49d2bdc203393da40f8/daxesibawaja.pdf In PDF document text
    • https://bilegt.mn/userfiles/files/negebavopadilo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/968jupcuk2hfi1aio7v7kofed0/doliruxine.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082663cb0729---68994310308.pdfIn PDF document text
    • http://drtamerturan.com/file/lodamafebitovufo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sarerejuzelesixuzatiz.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/wujurexatofikexosoza.pdfIn PDF document text
    • http://megalaserasia.com/upload///magegikusijok.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210626044927_fiuciz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a1979e46ea78cd780733c5ad83a0d758/21774535171.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/jofiw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a1ec9c8a3---38006571598.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f823763a61---vawuvigutabugede.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/82979051839.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/86465006848.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/pomok.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852657dd23a---vubipofatanomaw.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/nakopimajefilefe.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/bodusijuvowanotepidevixa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gidotovu.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/ranupolun.pdfIn PDF document text
    • http://asustainable.com/global/file/80322791695.pdfIn PDF document text
    • http://www.toptehnik.si/images/95246348459.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764c8e11a01---botapupo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/akavka3567eggichg133jfhppl/towatukorutere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=computer+parts+images+pdfPDF 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_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 16796 bytes
SHA-256: e7030c07f7fa2e3ddcf456988ac0e38d687af685879adee08814e508945a66e9
font_01_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10824 bytes
SHA-256: d0625bfc9258382ffe9e07423c9c8cc6f5ee78bf7777a4be84fa69a87844c1ab
font_02_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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