Malicious PDF — malware analysis report

Static analysis result for SHA-256 2494b0fa7c3dbf26…

MALICIOUS

PDF

78.0 KB Created: 2021-07-24 04:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ad4d8128ca549df06af51cb6a3ebc7d SHA-1: 50bd2368123b86632db41954002484918950a3b1 SHA-256: 2494b0fa7c3dbf26e6ed44f92b4c6fc99aa19589350648396aeb7b01bdf1a10b
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farms suggests an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7573

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://tomaszskiba.com/userfiles/file/feluxijesevulinusubamule.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/kupotufowarimewu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/54695739557.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4ec22c8e---burataxekex.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/73mam4clq61il8repi4mth9ico/mutomosasusoluf.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/3203598511.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/xupodo.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/37730472506.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/baturokafukugeveton.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ccf923181---bokepasanurilefetibi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a20b9e6e5f55545af440d4bec3ccfe20/76231223234.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/topomupidivokedune.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/gadez.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/02a9361ef9db6a90f7810ea15e2f7601/89684598535.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14a2c7629---wegotopewevumuna.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7bb89490---36892050919.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e9966efc432e865a76681e4e68bb183b/10390411641.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/porego.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8529c03124---83597328509.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/giloxurowexofusowakola.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b875e6858bbf3f2fcb115c459483bcbc/40709363828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adobe+photoshop+cs2+for+mac+free+download+full+versionPDF 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_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 11376 bytes
SHA-256: c946d713c8a02d290424fd23254014316040d321190159b6bb36f5bbe6e9badf
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16556 bytes
SHA-256: 0f47cc98f470a8f6883cc3f04cf7f17e7f3c6c257d871735fef33e76b0ba7eeb

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