Malicious PDF — malware analysis report

Static analysis result for SHA-256 5836ae4d240b962f…

MALICIOUS

PDF

73.6 KB Created: 2021-05-22 18:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44bd753907ba97eb155380012890e540 SHA-1: 22fe90048216e2a5124e73537bc902e034f82c36 SHA-256: 5836ae4d240b962fe3693020e4254a9c9886a969cb4019d3eb6e9f89063e5b8f
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, appears to contain metadata related to a technical book, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7281

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://pixomot.ru/uplcv?utm_term=systemverilog+for+verification+3rd+edition+pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbmgge3bpm9i5pmesen0a2lr3n/binubokagiluruxu.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/atqq5j12nov8taaouoijbbvf8u/juxavolezafumokukominop.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/107520285cd5bcc6fd1beed1884adfa0/49219158009.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e2f5158da---vonedokadusixipakabopajo.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/377bf7d2f3bdb90de0574695a9ad5925/28818519019.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3798f96a6a07c2f53680f8c76f2a42a8/50564094508.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0def577935b68e9f6d37a46b9d0b4138/63276451672.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080687c515b0---61465479984.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3280beae0b---jijitanosifaro.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7bd658d60---98897185363.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d548380c---xirufemidegiminazurog.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/94b4e75e977a61305c78164d0fe97e68/49981640868.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d73362a4ef58dc89055280976ff962e1/kasobuk.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b7a6913c---xilekarizigekej.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85c6e0d3841779e109f9969fdb9f7e64/pagiwulojabowiselevokawu.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/8274f2fde4a85096cb30b883b5c619fa/96499802514.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2c.bin
43b74e87122fb47fc8ebb5d102d1d91fb8d57269797802dc74b9d87d3e68ff27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 5872 bytes
font_01_sfnt_off0000f184.bin
dad6ede3132fdefb910762b411e1ce5b12d8ee0d6f065c54a08eddadeebe5ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5692 bytes
font_02_sfnt_off000104c9.bin
8c4c57efe5701db3ff7344a8d57450c43fa4736861e9952c068487b7fb0b3aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 11096 bytes

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