Malicious PDF — malware analysis report

Static analysis result for SHA-256 762e8bb24ef7afcd…

MALICIOUS

PDF

62.6 KB Created: 2021-05-29 01:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1785fb35a95f32af280083b7cce6411c SHA-1: 77767dec3fcdc6cba32df8ffafe117371e8b790b SHA-256: 762e8bb24ef7afcda2dde903f04414a89142467f63d6b9e9e56965523621c7bb
174 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8553

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f6nr2l1vddp8bi962irtplieu8/sejarirakubu.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3ac6913c93cfbc60e9507092c43fa87a/rojuvejisa.pdf
    • http://sistersaviopublicschool.com/userfiles/file/74480683495.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a2h7v1lm40ajbjra5uogbabtcl/35638276932.pdf
    • http://bawaconstructions.com/editorData/file/1714962463.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa20279f7d7---38088989445.pdf
    • http://alkanboya.com/files/file/%5C/lukemanegesakosinidepi.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/98bd98db95a05a706ffeaae87d667870/dexorojoralobuvisazij.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b3b0ed9c---tirumotexebubodosax.pdf
    • https://artasedanasingaraja.com/uploadfck/file/toxoripenutasesonoxedat.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160990ea8832bb---32803595230.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b163bb4b5ed---31628666421.pdf
    • http://momsystem.ru/public/file/vokuna.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ffa588bb---nejufowenawifikavatopapil.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dad3e6da---gidera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=balanced+diet+chart+for+all+age+groups
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d954.bin
822082b97c0f19688d28f018f2848dd5dc5390d226c0b5dd11098c1c53b0504f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 5468 bytes

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