Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b0bc043255cc02…

MALICIOUS

PDF

64.0 KB Created: 2021-06-08 18:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 752110b5d96d06f719af0f34c5ec30d2 SHA-1: e59d9fb376ae71f9316e30f26d859a10749b6bed SHA-256: 53b0bc043255cc02b219b7651dce2a6616f02a7c24762ab2f41aff4d48bf70fc
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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://archism.ru/uplcv?utm_term=download+data+pubg+terbaru+2020
    • https://glycocalyx.nl/userfiles/image/file/21215914603.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609894f50efc7---31339438172.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/refijekijev.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1998fba94c---sodisinula.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b293013c1a---gutademofojaxakipadoxix.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5bab3c11---60348399332.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d183cb411c---nukoresisoxukebonudezoda.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2r1lp3djv8blb1uo2hpsklcfuq/15304902415.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5fc98302---rukad.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/963ab822a275d0a924b4519ab82309f5/daxezamu.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/sb2darhq5qeephp45oajc4es06/fogiti.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/17727514050.pdf
    • http://automozg.by/upload/editor/files/kafoz.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609833ad70dfc---nijisukelilekof.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d31b057a6fa66f38ad06be6e1b9a2fff/89883978866.pdf
    • http://noithattamphuong.com/upload/files/71753193332.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce87eadc6f---vikupewo.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_off0000ea95.bin
1dd9af2fc1c54a4d4107cb4cc31a0bdec451d261ef6c83994e93c5b43ba803d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 5456 bytes

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