Malicious PDF — malware analysis report

Static analysis result for SHA-256 765dfade4a3d623e…

MALICIOUS

PDF

67.2 KB Created: 2021-05-24 02:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc839cf35f6cd5232c4198d21a1b3171 SHA-1: dfc4c21bc2f1172359a49c3492ecd84e4fc16209 SHA-256: 765dfade4a3d623e25c1fd29a8a04c94a6db31a6af7aa379d484d4c57e555295
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to legal documents, likely intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/909fb0e0923f7a4ecb827caa60dce378/fiwejelejedosexer.pdf
    • http://dansecyr.ca/pdf/file/netebilo.pdf
    • https://perfecthospital.org/FCKeditor/file/83448542715.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/297ddb4a4e2af2eb2bec44be31f26c5e/zuromojaz.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160742ef8e49e3---laruleliwo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070818f5b068---35480954677.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07735eeaf---7526063024.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e19be156d---22420083456.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608781f5b1941---89026761215.pdf
    • http://azizolace.cz/images/file/papagalutadibipi.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d2cf6fc1ca36b3efc7dfb668cff3502e/pamoli.pdf
    • https://tavio.ru/files/file/3274276460.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/97fkcb4nm1n353dl0kjvh7hat3/33703119531.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fde9d8d7d2cd6202033dff7e8ad3d955/47458283559.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f4946a785687a95fce1d146b7fa0a822/99901087982.pdf
    • http://simonide.org/userfiles/file/tetefezozekib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=company+law+bare+act+2020+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8d.bin
e15984f091ae61be1bec71d4adad1279e31d586f792720e240e4b3196007341f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 5636 bytes
font_01_sfnt_off0000e0b2.bin
41d4d48f9200f0d984811f9ec0603d207f919de7c289591c724e6711c3f66baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 10364 bytes

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