Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae2a787394ebe1e…

MALICIOUS

PDF

63.8 KB Created: 2021-05-20 03:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30a2276b072d55ae99547cae583a3703 SHA-1: 4eecb1160817ef598399a4a1f394b31bb87fdad1 SHA-256: dae2a787394ebe1e3f331f7c14872fdd3262f1b5b97fda4d460afe24802d44ea
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, while appearing to be a mathematical problem, is likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9111

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=minimo+comun+multiplo+de+8+12+6+16
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094767d4bc95---gojumogub.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364673478f---kifufadagogegiw.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/rvhk285g4o06l6vvupgfausun0/pogavulibiza.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/srr5t5ng0b22341mrdan48594s/komare.pdf
    • http://allprintusa.com/admin/images/file/fuzumilibeduwo.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a594d7dd1ee---72506994591.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4aobmpegvi83jpd78dk3mvnv2/53429950688.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae6f36854---malulisibejeresonuwobov.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa819ed07c---42247486135.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/10b7e1d305d154b9f57bc6da09696fe6/27213094869.pdf
    • http://157.230.241.115/image/upload/File/koxam.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6894bf45c---70398992670.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/vup0b687un9551ld95v0oim724/41891788097.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fddf84001f---lipixupufowu.pdf
    • http://fittbike.hu/files/file/21431217852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc56.bin
ad59aca5001cf1c489127f1a09d80be04f0b85224cec3340c3ce6b54700ba30c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 5156 bytes
font_01_sfnt_off0000ddd4.bin
0e8deb7811fe47684b6a943572c846571c8adbab420a0fae72a76252a33f1b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 12368 bytes

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