Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c0aa51858fbb4e…

MALICIOUS

PDF

69.1 KB Created: 2021-05-27 22:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba1b7bd3b10e79301eb23aa719245c13 SHA-1: 5a5d532d8f29be593a7ee2d9f6cf448e32974005 SHA-256: d6c0aa51858fbb4e7341fc821c9c5ccf132b5e769537b5267aa1c70d1fd38def
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fontanarosaserigrafia.it/userfiles/file/poxij.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa016ac408e---gumemimapetebe.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953aa2eb2---nifazajoruduzezije.pdf
    • https://a2designbg.com/userfiles/file/bovumavilumetame.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160778bf3f0927---9759637527.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/cd41mfttk8slh4nogh6o2qkegh/24763090195.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89bc9daf8---94771970520.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc3bc6089---manibofuduxu.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/jiwinaxidukokoberuzikobet.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160940b359bd72---pexanimutenemebuwiraliz.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf9dbd9ec---71628624782.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0cebe3cc2f01efa618584421ddd4930d/6074773108.pdf
    • http://asianmosaicnyc.com/userfiles/file/26799206127.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a45af72bf4a---16645389499.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091ad85387b0---14414887878.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/95c04414fd74ebc3c1d588b6fb734111/54322196019.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26223d130---41230972606.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=debut+video+capture+software+review
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d071.bin
d82a23a00eafc75527bad1b5b5ae044a602bb3c70e9e3b5afc4d866538ab1a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 5408 bytes
font_01_sfnt_off0000e2fa.bin
91782df10799d111bf2290577128860b3a406acd3b57fd25f8cbcafaef0c72b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 11076 bytes

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