Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc3f19791d771ca…

MALICIOUS

PDF

73.5 KB Created: 2021-05-30 19:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64c7df5b57566a71ad155773f94e856e SHA-1: fe980a7fd60509c8d1c3b75acf03562e9434924b SHA-256: bcc3f19791d771cafe7d6d83d0bb99d17d85e6e2d6cd3be45ff52ea8c5b8869b
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to updating an application, likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8886

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=how+to+update+youversion+bible+app
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c82191e674c4802cfd70a1203443dc9d/30554979261.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5aee8693b82327955329c1907ac7352a/41706848741.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b223f54726---40761218288.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/7dbd862d987787c072fe664825b94753/33578590860.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687121ed1---55658282550.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb8f4ba56---mowubije.pdf
    • http://alnoorcity.com/userfiles/file/labugepemojuxomaloxabemup.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc61a28736---71551948683.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b26df1c926fe2cabd1f7b4bb57ce230a/81876465049.pdf
    • http://cnex.cc/images/blog//file/wimekevupaz.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884771f3617---giwoxefagika.pdf
    • http://axiomestates.com/userfiles/file/63782594646.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a422f0b0---82987927326.pdf
    • https://aartipalette.com/userfiles/file/famukidow.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09d8d598c---3963168493.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fd2ebdb5---2587533265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116a6.bin
2a51c1f6befe790524ac8606197b1edcf4614e0b4d8da5fafe3f62b484ac65cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 5308 bytes

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