Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2137c23d82ab87a…

MALICIOUS

PDF

117.0 KB Created: 2021-10-07 18:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74855312b486d2d5bbe6e9796899af56 SHA-1: 7fb0a812c9129089ea2adffa53aa3750f7305767 SHA-256: e2137c23d82ab87a95cad85a7f4ace537ac82accff2164f2df49713ef89aa0ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://indreninepal.org/userfiles/file/nigasekutilojezomumeke.pdf In PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/setatuwilerakeduvoxaneni.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9f6cd785---ripudekekexilap.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/jixejidisemusufunit.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/xubimise.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9aee152d---63324443085.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161533fb78c82a---38460027661.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/31937375533.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e8bc24c23e8707b71372452384c27bd3/kapojakugofavaxubikenozum.pdfIn PDF document text
    • http://dhf-china.com/d/files/zojetitiwesadidoxeru.pdfIn PDF document text
    • http://someteme.com/archivos/_20211002220322.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/dajoxuji.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/tuzudufidilogibutir.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/62727373129.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/97355201928.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/bavopuru.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/makovejaluliwogisonefel.pdfIn PDF document text
    • https://aashianarealty.com/file/34556168277.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/22289396878.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/55796885424.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/jenerilemedemif.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/83926056196.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/61194453384.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/85552485545.pdfIn PDF document text
    • http://dogable.de/userfiles/file/botodenidivojato.pdfIn PDF document text
    • http://dmkert.hu/files/file/vopifolulop.pdfIn PDF document text
    • http://pvvc.cz/files/pekevunakebesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hayden+panettiere+in+law+and+order+svuPDF 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_off00015cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEE 10744 bytes
SHA-256: 3c3b007316a1e59b8815a67feb3673e5d65ec34063e24d393e618e9ff9cccc22
font_01_sfnt_off000175bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BD 21436 bytes
SHA-256: af38bcff072be3b3b5662706fe7faebe6ac9c78c423d9af1f69749f7b318d457
font_02_sfnt_off0001ada9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1