Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d737e310e86a01…

MALICIOUS

PDF

72.0 KB Created: 2021-09-07 01:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f53f28adade032989171ac1366aea54 SHA-1: 49ad831454c3a9a82cd172aaa68801b4bec6197e SHA-256: 52d737e310e86a0113de144eb81ad1a822bc60c013d97b8f5d5c00bdd68b0127
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dynamic1984.com/user_file/file/40828933029.pdf In PDF document text
    • http://donghozibistore.com/luutru/files/94377088152.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080af353d25e---pitewimuzujajugi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ac723c56---30585351399.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/2740615200.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/42762254005.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bebc8f35---tixuzexawonosatewepegirel.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c00cf83b490501b7d9e4394654d223e4/47691726859.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/vonimer.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/78933571550.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/sovixiwamixe.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4245ef98c7998fa7e992ca5d8b2246bf/73992032502.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd647a4a9---32567344506.pdfIn PDF document text
    • http://bienbao.org/uploads/files/11026293354.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/1355894918.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607199edb03d7---xipexibige.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/714gh2i63b7t9bjnltfq38a13n/gefali.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/14527528202.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/12980688862.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d9e05f444---fupezunideri.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/venolibumujusurelatizufe.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/betidunegim.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zemugifalubanavexarevijom.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/xurowunewo.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/fulekuvuxividalidi.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/56297169020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rhinofaringitis+akut+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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 16896 bytes
SHA-256: 9bf3fa4915a58b71a6be94f81cb4d98372168e623869132f42eb1aff7ad53cab
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 10836 bytes
SHA-256: 72c3b9d71ab29d39f79b4a9f58874de27fb016631ddd61668c49669f3952318c
font_02_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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