Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c055656be7afe75…

MALICIOUS

PDF

63.5 KB Created: 2021-09-04 12:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 020433d7f3bfe465806e4017405f0a3e SHA-1: fcfd66634112641d5cdd737ff1c3e9faf5e45d1d SHA-256: 5c055656be7afe75fafdfd1781faa9fb41b66764dbf7bc0ecb43535a5ffe3716
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised websites, indicating a likely phishing or malware distribution campaign. The ML classifier also flagged this PDF as malicious. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to host malicious content on various platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7100

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=architectural+company+portfolio+pdf PDF link annotation
    • http://grupopiscis.com/upload/files/42972323093.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/zemawemedoduwoxusuviwu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e6a056e---pabuko.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f08621feaf05e428aad72c630dff82cf/71770014217.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/82696242072.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tho0898a4eocrharu9lqpshcs7/lomusixuwuwotinagor.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/6446758807.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c7ce38f2---zovavororatud.pdfIn PDF document text
    • http://tavio.su/files/file/winoleb.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/25915902354.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/koxalum.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/bikuduladawotawi.pdfIn PDF document text
    • http://dsfly.com/uploads/files/38952677370.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/36927412559.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/bawogokeme.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/jafizenekufi.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7076affb---36361258230.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bb96e39ca45e4cb16f84aa627aa5e97/bemako.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16119861d0061a---39874735089.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/nozumavuliwavumusufabog.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0a3332b2b7f5af9458455c4c9b07591f/monuwujotonenur.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610edc6b4a459---15181241942.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/84537542481.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 16000 bytes
SHA-256: e340aca0287251dc4e8eeab4974692739cb2b36e2cf888a339475c50a95d8d78

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