Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d1036c6998ddc9…

MALICIOUS

PDF

66.5 KB Created: 2021-04-27 19:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc3cd42f5559f3875ff18d472d563a5 SHA-1: 9f517fd516eac56c73e9d633553e9f2692fbff7b SHA-256: d2d1036c6998ddc9d799e130045be71d31814a3d50b9b79e5252441ab0172ee8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the heuristic firings point to the PDF acting as a link farm to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c55c1d62e---lofusuwuwozolexulo.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/l25kpedmo50cb3ombngh70e5jj/ravosuvaxivewetixazoji.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cqk33d0gqjohrafoe6h3cj9j91/4496022694.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2a1989199aef2ec74ca46c6d41cc0d86/mekisokaliladumotedok.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/32e83ab3707d61fc3e8dd710510563dc/kobaxakividuvinawinaxez.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/604388fe9e50344f1d85f3a4d040e5ab/89392044042.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/858de81929ecbbbed530fa3e5ad53246/fuzalivuvumibiro.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/f8501e988f72b24a5871fce36f950b27/63321507290.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071970438db8---narofob.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/6nepnb18b0d4me45m0c3mr3o2d/10101790421.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ab7efe964a99f0fec887c5d138c79e0d/12260528134.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/271bd63a356c5579cca392f6b88032fe/62185965010.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25ddd124c---2917286205.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077718108502---7070316593.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/77a94f9eb4ef45dee7aa8e44b1250699/55052618200.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11af3b605---8644414950.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cgiobu1343ukb53l6djb6fbiu1/semelasule.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160800def439b3---97362663351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=basic+strength+of+materials+interview+questions+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e182.bin
0981a1f34b17360b348dc1c72849613c77941fff0156d6887d70a04123efe7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 5896 bytes

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