Malicious PDF — malware analysis report

Static analysis result for SHA-256 37932c60f8a6cb08…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 20:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d55c9723e19d2806ebe7f102e0b26468 SHA-1: 82c834864612203545e93e2ba8c38657401bb504 SHA-256: 37932c60f8a6cb08b63b42a4fd42c810dffc282958873fc9fc8acf5aba59ea8e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=cooking+fever+mod+app PDF link annotation
    • http://fotostudiovaccari.it/userfiles/files/nakovofutefimezuko.pdfIn PDF document text
    • https://netpage.info/userfiles/file/75087895580.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f22c5f03f---fisogoxaj.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/14368116021.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/zujaborufexuvapewumop.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/42650738633.pdfIn PDF document text
    • http://bronia.org/userfiles/file/47033453397.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/nuzevatuzararimiviriloxo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/92713944551.pdfIn PDF document text
    • http://shahgrp.com/uploads/73509448456.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109090522542935.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/vegifitatixifaluwigi.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/99235398696.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/vegapiku.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/karutizoj.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kilurarogu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dc1595155b83ce42e6b623d03f9def7c/92742617001.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/51773658.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/63412546669.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/75418932029.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/nagitetufizuwudu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fef5c209---73317353924.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/46efe0746335c078af2747879dfc5a24/fotedimigakawiwo.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/zejoguxaduvagaf.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_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 14456 bytes
SHA-256: 2bd0f42aa608ca66e0ca5bac27009f406749a20cb7adc197797d714b92add117
font_01_sfnt_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 10720 bytes
SHA-256: 2f154ef657b52505ceef472dadba8065f23092b426ee2d26d6550dac1c341eb1
font_02_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1