Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef585349ba12bf55…

MALICIOUS

PDF

91.7 KB Created: 2021-07-20 20:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a15d26a2b82cb139e895e7694ff61dde SHA-1: 0b2f474f77fe5dacd71b11267d043730100ae752 SHA-256: ef585349ba12bf5599e7de28332fa09775a00e0f837fc1d657a39f2650e527b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the phishing and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://debden.org/userfiles/file/xetutapos.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3cf65b54a703884ad187c4e048c97fa7/41715730821.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734f4a38580---94171456275.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c9b499nm0frg34hmkol79ki558813tgt/41702151439.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/aaf759b8290186c94179844fbc9e16e5/gojelowivadodivo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958b73df4d9---favopajurutoritotaruvof.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/rorezepobaxopedozolifixa.pdfIn PDF document text
    • http://promador.pl/userfiles/file/keritirizu.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zovip.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e59a39b02---fomibetuvuvizesit.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/adk5dunmm3p3n2ejv34piuk45m/sazixegupanobuwa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/10052412310.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/61968491403.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609053e914c53---57745721932.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/28710653296.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/bafigusivitebi.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f330a62e03---3323387848.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/5193266099afb173f878f96fff0924bf/vebowatikofowezu.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/95053876160.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63ab16f21---raxivosugekeduguzibopipox.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607296443bd33---2521580213.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/76715915365.pdfIn PDF document text
    • http://messagenetcommresearch.comIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=after+odysseus+men+eat+the+lotus+plant+theyPDF 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_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16968 bytes
SHA-256: 7499a9b989fdb31588b820819a804cd6706efdaa65850fc5147a2dbd00080dce
font_02_sfnt_off0001486a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486A 10868 bytes
SHA-256: 6ad1e3e54d657a8e49c2df87e50bd8775e305dc85c94066aad6966e4c2586747

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