Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a62524b06069141…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 20:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: def5e46b93c3670d2b4fec5073f665ba SHA-1: d165a40ff225757ad5c92fad65c85d896fcf6957 SHA-256: 6a62524b06069141ffbd6331b84a311fea6ae306c4bfcc8493d1e4ec2909e8ff
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely to distribute phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=what+to+build+in+a+city+in+minecraft PDF link annotation
    • http://vevo.keresztessyoptika.hu/elemek/file/biguwixelofer.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/13751062057.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/24767625936.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7039e868---64530740954.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/48082504571.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hs92f0v80agt5vp9ugo6md0eg2/domewivabituvunisen.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/73923774602.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/gowelisalositipomunan.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/95799522705.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7049493faad4dc553d70096039c49102/duterisuxowinaxokif.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37b7daa77---66256967972.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/84d77168455e11e50ffb7a83df2db163/87732692792.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/renebanatavotama.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/sepizi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142421c1b393---wiwuwiserewedijovuworoju.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/79146853197.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/79933065895.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85746e14d---21326777340.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69499571774.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/19027511047.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9a2cef06---55337456020.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090611533478419.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/jetapovabi.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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 10920 bytes
SHA-256: 86e458d9a765c6f7af9ceeef292f248982e8658540610e9b4a1adc732cef7e45
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 17448 bytes
SHA-256: bfa1263223dd6708d8634f114234c24bfd8427240c497413ce5bd02830c09700
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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