Malicious PDF — malware analysis report

Static analysis result for SHA-256 616a7a19314cf3b6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-24 09:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 70089f172b084a0067bd2e30bde1e4e3 SHA-1: d4fdf7e058e9fd45a2a4ee527640468f084122c5 SHA-256: 616a7a19314cf3b6824fc4ab8b98cf3e69d99c126503ed3ef5f1553e7fc27437
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms strongly suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7431

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://crysiq.ru/uplcv?utm_term=clash+of+clans+coins+and+gems+generator+without+human+verification PDF link annotation
    • http://cablexconsulting.com/Upload/file/pevovejavijozagifo.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/12955611943.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2f617cc301766f4c5c37367791077ab1/57000862432.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/vinivodo.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/jafapemabajavixij.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/74875163902.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa6004a0ed---kisezotitujusi.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/giguvimamekajibugazum.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jadafemu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fe69b8ad938fec40073b47538fd7008a/zazelurinemumox.pdfIn PDF document text
    • http://decorstore.eu/upload/file/61429987601.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/113ad09456f3633bea70e45c2c7b0db4/88212813406.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210920013305.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/2848169750.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/majegoleseterugowijuj.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/vejaruzupuxir.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109090559493108.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/detosafasirugoniwizis.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/kimol.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c880416fa47671dfa2d17243624680d3/8928563707.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vudekuxebokeresiwinuse.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417eefc14d1---65942092148.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/73782298907.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/77703589677.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 19176 bytes
SHA-256: 9756b96703ddaf65678f2dc5a00f1720c5d3b6f308639a710619fbce121c54f3
font_01_sfnt_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 11204 bytes
SHA-256: af964fb6fe6a69c887c7c9dcca112c1671f0533791108e6b7b33ea437332417a