Malicious PDF — malware analysis report

Static analysis result for SHA-256 520bf2bf8fd40b83…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 22:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab37f36698878645b6044757b504a264 SHA-1: decda5833601daa82bce0d85fff1cdc062ff2484 SHA-256: 520bf2bf8fd40b83db5c2067413a71b47601cf72b3b7d28935abafed382ebc8f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, directing users to numerous other PDFs hosted on compromised WordPress sites and disposable domains. These linked PDFs likely serve as lures for phishing attacks or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=can+you+eat+out+of+date+mushrooms PDF link annotation
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ghc8isb20dkunmptep64gqehd2/79214113463.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464cf4b88b---sotifojixe.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bp5dn3jvm3jdfn31m9f9uh4ss4/13268316232.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/67505878345.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/10963478128.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/18353195299.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/24bcfbf3e091b41e5a276b81cfc3560f/nazazeminopij.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332084c0d---55178721596.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b42471b20---botejopixixefitu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/dagaxir.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b2d6bc4704805dfbac1162eb5b7181b2/kukamovok.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0132f0093f---67564111738.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/53652740393.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/16027059532.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1dd39132c---77094426194.pdfIn PDF document text
    • http://aimic.com/userfiles/file/muvej.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/zulusujupoxunorizufomufu.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/gowuriridepit.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jq4vq4saouchb2kbn81375q0ll/24196027995.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sifid.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/magubilofuzidigonuma.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/60172762788.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/gexozejejunofalonemopa.pdfIn PDF document text
    • 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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 10728 bytes
SHA-256: 1fe7ed6bf8e400f9edb546a3c722648c8745c91226e643341b36b572483cc254
font_02_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 16224 bytes
SHA-256: e447c1bdd228f69030acbdb58d55f2147e802d558f580ec0dcc359c10a95a254

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