Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cf89e6507a1ff6…

MALICIOUS

PDF

97.3 KB Created: 2021-08-11 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25940051f7180abbfa1f2866ae5457a1 SHA-1: f3ed6df25d47d7009c6b8a8ade207f9cd545b6c8 SHA-256: 50cf89e6507a1ff68de1c2a70b6a8d813ff83005da7744818a58e5a9c0d8afff
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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 http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0cb7a8424---27170310886.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/c20f19be2b1843e3a6fbbbf116695783/ratinala.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a669d54cd---29415514110.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/ninimop.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16070a47699b32---vanupalulinibawarijuroj.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/48876414617.pdfIn PDF document text
    • http://sgpeo.pl/users//file/memuke.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/74742131294.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdd34b877---34139035941.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210707_246F368DEECC0B56.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/edbaff763062dfc14b5bbedc414edb9a/14291913699.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b9caab37580cb4c65ef390df527adee9/pejivotaxuboxareko.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/kopikekemupanuradetopi.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bisir.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f608e9bd2b4---puletuginigadidin.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/7781439888.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/nemegovapokukopu.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/8960313392.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/75228189406.pdfIn PDF document text
    • http://promador.pl/userfiles/file/rukofixuxaserej.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b3872438---tunevajalifijerawag.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed988ed1d18---mabiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+time+in+abs+cbn+tv+plusPDF 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_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE4 11104 bytes
SHA-256: b56bcafef184f1c85323735306797cb1fa20b9ceedc8a013d67a8c72b319f8a2
font_02_sfnt_off0001476a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476A 17964 bytes
SHA-256: dcb63fc1189835a2da86b89535249e01f29d00409f242290009fa4e63c54a922

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