Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e497a7e6238b535…

MALICIOUS

PDF

65.6 KB Created: 2021-05-10 05:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e5531c41057f758a4d9855374e47010 SHA-1: 6ba28df30f4e095a0e6262734c7f19feb33dec8c SHA-256: 1e497a7e6238b5351a339a07e3d272f7426047b67064177d119afdbca60a2ec3
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple compromised CMS upload links and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd37b7777b---86578745084.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab639c819---15708770831.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/33c7adc5f88ce73d5537530b5fc741c6/13803167598.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8039aa61---wetavezuluwedasimezijimav.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160932b5058a71---kopezimer.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b0e3ea60a67cfce828830916ad737001/1764196040.pdf
    • http://beiwendq.com/userfiles/file/57930674896.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d75aba4f---nafaxij.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/bf4dab0e365adf28f148288ce28066f0/11801835660.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/234h86q4652dolcftanbdme7tq/jadodosopobut.pdf
    • http://clarksville.net/wysiwygfiles/file/tukalavitubusi.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/52b6d4ee838349a6787cfb06e0d09a3f/10252721902.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0a703272---40459551069.pdf
    • http://tuzvedo.hu/elemek/file/39961082359.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0e0cae24fc20e62fd0636e60e712accc/78060097636.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608143aadf2d1---43839615829.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1543b9b6e87e790a9396d3aeb5186328/tujowodepusosaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ad+aware+lavasoft
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfc.bin
a80e6d120b68293344b49226edaae939a606fc01db42ef395fb1f663e26e1214		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 5044 bytes

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