Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0345db3f55b1f94…

MALICIOUS

PDF

67.4 KB Created: 2021-07-18 01:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7661bf3724b93e1831f60cbc7d9109df SHA-1: 5529ea10ea9aecd0daacf79a7ff6d2aa4ce9e5e8 SHA-256: e0345db3f55b1f949d80b663386e2a70d4716f722b7e64c7593370af24fc976b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c19c811cab34a69f5034de801ded686e/polimudi.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a2ifapf2sb7qj6j9fugsefa0a9/84114230793.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/9207344516.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/78159765919.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160809f449d0fa---14428263172.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607abb4c09e9e---finefefasitibukop.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/29089165139.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/93918465702.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af0b3bf32---42367025256.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/54596372390.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4496dad0bde946874f24fa9b6ee77134/66825976379.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/23657588326.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/80488056098.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/pilenumogizuxasomono.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/43591012677.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/55138239883.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ph71ktjr96ge78mb7koqa0o26p/64141253865.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/zebunoka.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/92539387888.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c61592cdf31---nelaboxewaro.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/34130722141.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160727f31b3eb0---totanipupik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=1+ml+to+gmPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 9648 bytes
SHA-256: 4d3c2075b6e985cfea62c0478c3d66abd8cae91e5e5b14a14107bb24f483df2f
font_01_sfnt_off0000c48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 14460 bytes
SHA-256: f0f559f36a54afba1d86302e21fff3e0c1b590432e7c844d74c37b8871f68a49

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