Malicious PDF — malware analysis report

Static analysis result for SHA-256 468c8965e89b6377…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 11:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbba97bfc8e8850b52d250a394420a7f SHA-1: 0b48e6f265d44c70f376d2d11a72d82578da883e SHA-256: 468c8965e89b6377b0b08ce2fb6a5ff39e60eb5f4d1015d434e10e77a533282c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of URLs, many of which point to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript (T1059.007) and the nature of the URLs suggest a spearphishing attachment (T1566.001) designed to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://coretry.ru/uplcv?utm_term=redmi+10+pro+vs+poco+x3+nfc PDF link annotation
    • http://abwalabamaave.com/uploads/files/perorom.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/95888877033.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/37999982982.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvelebi.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/xewajimemudupin.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/molimuxevikunewiwanowotu.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/naziwusetad.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613503116f6db---21550355648.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/notabeniduga.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/27307028808.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/xudakigalibe.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/12228122085.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/57136010525.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/fakege.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/26535662839.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149a088c48---9666784953.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb97940daf---sasejazalazuniguki.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/64142645137.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sqm95mqls1t6qbmpl0118oqff1/wipevopixedugomog.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/xexiragawofenusuzerak.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/96138760177.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec03ec2cb3359e09b3ba83206dc552b9/wajaji.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/12351708545.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905002736.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908195336.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 11032 bytes
SHA-256: 6ee7b0ad6b30452841f84cc81e6d8978365e585a500b3187252c5eaff76ca12d
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 17800 bytes
SHA-256: 68ed0d83d93c50ddc358bfb6984ac4a31925f183d26bd1e424ef99f52a345560

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