Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a13097391b6431c…

MALICIOUS

PDF

71.6 KB Created: 2021-10-04 17:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 78b70a7094165d44eca8a1060687d46c SHA-1: 6d950a3f69b5daba1a4080852656d630f878d69e SHA-256: 5a13097391b6431c9e256eaf6b391fc0ea210ab603e6ab6a9a46287a60babad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs and the link farm structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=polynomials+area+and+perimeter+worksheet+answer+key PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615222352952d---ninowexakabexo.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/rofawumusitadip.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16153e17c17206---56154928567.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/ribuxajasudidopevijozadof.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kubovimololawowop.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/61393769494.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d75935ab8a---puketogajipasanet.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/jazurekibedapewunowa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93bccfeb---74451668719.pdfIn PDF document text
    • http://net-marketing.hu/images/files/lixejuzozozumixigusa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153af9161cc8---91500463406.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/vataloriwufedilubataw.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/62774551809b373076804ca94bb4d2b3/45204772072.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145edc0dc3d6---85870225232.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/21627491837.pdfIn PDF document text
    • http://prosquash.by/data/tofidigisigavik.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/pazixatosak.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/38585502672.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/4557398195.pdfIn PDF document text
    • https://wineart.online/userfiles/file/38707230151.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/wolukewawajuv.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16148becf65071---fiwozebotekek.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/kolajelox.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/84342959335.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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 15660 bytes
SHA-256: badb8adc15247395b5a2830fb213c0472dd51c91ff44db71f32e54eb377a45c0
font_02_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10948 bytes
SHA-256: abedca5679b0a1f9719316b5872898a9487d547a7d7904c66c3a765f0d24fb14

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