Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dc20be3c2dfdf5…

MALICIOUS

PDF

69.5 KB Created: 2021-05-20 12:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3faa50d09e42d0ee36db20af565f119 SHA-1: 5bb02d974b0fbbe6d28e03b84c9f13676a1a5c4e SHA-256: 20dc20be3c2dfdf5b6620510db7af24bdb73f38bfffde8c174f5b65b202633f8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c22bcb6001d43f47eb38c18c55b2e41c/26015360996.pdf
    • http://www.odnpoznan.pl/fotki/file/file/51130510128.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab8dc884a---4849650726.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b826e07e9d---meborok.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098682a8e528---34091560665.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/j5nvdad22utqi1hgkghlo2bug5/45143337497.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2e2589768d6a333fce4a3baced9113c3/lufivabesomuxafojir.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/siqnl5a2kp7bv0ki7dtfqs32s3/lalox.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/751ef477db21662969f7abc89f643c3a/73800129257.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b07244510---fezobanitumibinogeja.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/14ti4vpoo5e0d4n5ndhk0hsjn2/ginisinaga.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/70bfcaea8a827feaae2f6b87f3017140/37673519694.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/54e91685b5b41962dc3aee0701fbcf64/27415649146.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d315785d3c---fogabadid.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/be195ed4aaa6e541bf1f1863eb1f2b1c/29625129466.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098920a10084---neket.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+simian+flu+plague+inc
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd59.bin
426d7af4009552b5abe399f60b87321110ab4d16feb971dc7706153d5255bdca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 5292 bytes
font_01_sfnt_off0000ef62.bin
81d2862d6fc474218b25cbcbc7ca83313a8c85ec888867cfaefd5543891fdc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10568 bytes

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