Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6ee602db22f400…

MALICIOUS

PDF

117.3 KB Created: 2021-06-01 22:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f81fd708755cd7079353a3d6519f360f SHA-1: 3b66aeca3ff081191e2ed135917d9e41ef27e971 SHA-256: 5b6ee602db22f400b814b70f1e97d98cc27d323a72d9b71873b9fa2b311e474f
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, with a high ML score and ClamAV detection. The embedded URLs point to various domains, many of which appear to be compromised WordPress sites hosting PDF files. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7827

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160957f5ae17cb---letubupivoxegolavovo.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074966c8d885---14499756120.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016fd5deba---80215801526.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf27b1aa7---viviponuwidamepadiv.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/jelulixogasiwafogab.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/bh93cl5sdfa9onmq2rcb7k0vj5/dabonenazugamabez.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01331c0cb594525592c4bbc5f5099401/tejonudetowafasij.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf9777fcd---nabipuzevatuvedafobodizom.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f1da79a8---67707925620.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ac1497592509ed45aa63f7101ffa0ac7/fifujomago.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4261ec07e1ab6886b60412cd253297d2/dobasu.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fb71ab6dd5470706aaefef21f6fa8a2d/41127888799.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/26e521fa1bbc83a226b597bb428cabdc/87744951846.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d3e0136ae23c8263e2d5fccc62c0824a/55070179198.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b18f13a650bbfbb73eac868147b5038e/7765572843.pdf
    • http://drironcat.com/images/file/58474040865.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b1958fef---96841912461.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847727443fa---nimosofonisa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mortal+kombat+chaotic+%2528mugen%2529+-+playthrough+1%252F2
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018fe1.bin
edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE1 6440 bytes
font_01_sfnt_off00019fd7.bin
1c88985c510b966893a773f27218b47f263da89987456764687accecd6a8594a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD7 5884 bytes
font_02_sfnt_off0001b3e6.bin
3a91dab0430f10a8085c867136d39e07b5d74bc0754d2710a47c7589dcb3de5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3E6 1592 bytes

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