Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a48e5860503e44…

MALICIOUS

PDF

64.0 KB Created: 2021-09-07 02:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c89f8b4c793591c79c36588ab1e08b2b SHA-1: 0d15c3be2fb0ca92131dd4c4378c378a0823b22b SHA-256: 46a48e5860503e446162298e20de233c71b60f425c7b6b506ba77e12745b3446
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The PDF document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose of redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5541

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 http://kleinschaden-expert.com/userfiles/file/raxew.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kudbo8m2kj3te6gsnm3ev9t4i5/50765249290.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4911618de---kurijigabexakawukoxixiza.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/tenun.pdfIn PDF document text
    • http://seamacros.com/upload/file/20214664966.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/11569869014.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/89089640396.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/20115315020.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/melid.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c719edbfdb---fegewibumezexe.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730cc141bb3---452545519.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/4f4b469a053a207cd877d1e09a7708f8/14297820681.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607704d889187---lukamewopudi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116b134b19b9---34329861997.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1bea2e9c---59369504695.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/nujijedekojew.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/zapatasilisuxobukaxusupa.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/negudowek.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/35589648214.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/refoluliniw.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccd87bf71---rokoxanipegovuwexisa.pdfIn PDF document text
    • https://tonitomov.com/picture/file/kojogijitududugimizasata.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/74e3d3d3eb4f736330183d77af26f25f/32528294974.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d07548f1---23556614126.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/82047129528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=history+of+public+international+law+pdfPDF link annotation
    • 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_off0000bda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 15504 bytes
SHA-256: 8ea620dc04df9eb65fe393c4a6e94f4dc9abeb909a8146464f10bdd74ad1b7d8
font_01_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 11044 bytes
SHA-256: 956dde23090ab082a2b2383008e67e4c793ab96ffaa671cd632c262eedf1bbda