Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7859de72def907e…

MALICIOUS

PDF

114.3 KB Created: 2021-06-23 21:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 974d1b757533b7884fa7b64f29c3804f SHA-1: 6d3ff2756a21dab79abdc925c3605a0f7dd16ef9 SHA-256: e7859de72def907e674e8e43c5e9f85e7220828621ef9bdbd3baf92675f9b00f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of a link farm is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5139

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://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/711524503e74412202d4908f2dac8309/xibimejoz.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607205f648433---konereziwusamojiduxo.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/14414858053.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c15667c2---vadepunizojukovo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7ef4d14a156e7bbe74075026e2211311/nufapitoze.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/51502539896.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13ca6e522---rixemorovefubodolez.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/sabibejije.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edd564417c---jufojojakev.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/7tba0s8m3ghtimcsqjl090fkll/32235642868.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086793c75b54---paser.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7162b4dc---63333001836.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/49331338829.pdfIn PDF document text
    • http://yongqingtech.com/d/files/56939529485.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/womopoxadu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/29473522729.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160771693086f9---gavobunakukonu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mario+64+dolphin+emulatorPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000177eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177EB 4720 bytes
SHA-256: 2fb5fcdd1f6a9517a045399e7e63f432a3d3d487de198e195c40d418609d071a
font_01_sfnt_off00018875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18875 5268 bytes
SHA-256: 9443343909cd6527e7c267a68453519721b334f7889493a0762b06530ca20464
font_02_sfnt_off00019a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A44 12432 bytes
SHA-256: cf0e9344cb8e154fb7c2a9f6b94248587be45e3de5ad87f0a6c7f2d17f1b3c9f

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