Malicious PDF — malware analysis report

Static analysis result for SHA-256 d306b7211975507e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 09:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97e2a52326888add86e7ee5833666eb3 SHA-1: 69efeefbfd4ffc34cd0bfdb7828b246b6314a997 SHA-256: d306b7211975507e34881de475dd5512532b28c4ccfc679d7dfdedd5fd9bdc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://forma8.kz/ckfinder/userfiles/files/sitevonewijazux.pdf In PDF document text
    • http://esistore.de/userfiles/file/deranuxax.pdfIn PDF document text
    • https://bauarch.bg/files/17812448029.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608308b425a74---83493014225.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/75814368763.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/68016822195.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/lagagofo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6cb2aea90---januminivipudejobaxewir.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/80365638708.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5f071726e---41847866375.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/28738347284.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/linefudijazaxis.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161204772e985a---pikomivipizofifimaxuz.pdfIn PDF document text
    • http://fotossc.pl/_files/file/tukarawipova.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/2735234276.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7b34b530d30247395695edd5f02cd56f/73369546207.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/tobarefosi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/980e61992cb81f1b7c15e771cfd110db/57916732533.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edb4620b11b---1826609935.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/96950078223.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/1df37817be5d3ba61370ed08256d0d19/79087962609.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/wajekak.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/pusatege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pronombres+personales+y+relativos+ejercicios+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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 11232 bytes
SHA-256: ab5788689c2c4fb89463c425bf4953d64904018773003e0a090c19b884297258
font_01_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 19784 bytes
SHA-256: a3d01e9db33bdcfa9d63c151b4910534ae9501f19592f71a716f331b16692c98

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