Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c28a8acd764779…

MALICIOUS

PDF

93.4 KB Created: 2021-07-06 21:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05260dbe22c7c4cdebc6dbca6fd49fd0 SHA-1: 241abe46e3c34ce3bfbfb722c34766571667a951 SHA-256: 97c28a8acd7647798b3134d8ca32694578cb4993138a3f6b7c545bd7869c7dea
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute users to potentially malicious or phishing content hosted on compromised infrastructure.

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://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d755901ea---83793994136.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8692b7fe3dab8e06b2645575c7d313db/zajiwisekepofekegusumeget.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/id45sd1j332d0e35ku2ldjjj01/31743626245.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/jazudorababamonebutibonu.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/c72b4fb4ecf1fa7baf27070d12264a97/61380678758.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c22ab759f3a482899660e5b7a754f863/tenibonet.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/71e9fb37d3122a213663316473d2a08a/57202719250.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/tirobo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942e7b7b553---selokowige.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/lozuzotiwuzedidagum.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87c2bac85---jexefarizikozodinapirij.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/18955449956.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43404e272---30881476898.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609100fb1dea0---77203413652.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/jabexuv.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086549b6b297---losevebeferolovifix.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6096ad638---zunirigunidiwopajeb.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8b26b908ccbd22bc3e11c315512e8c81/linupup.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/sewitemupenuwu.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/pipovataruzul.pdfIn PDF document text
    • https://kawanmto.net/contents//files/9455183179.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8098d05ea11f3f21b3c9929fba5544ac/89669461387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=baked+macaroni+and+cheese+with+goudaPDF 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_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 11100 bytes
SHA-256: 546ea84c866e8cc1938d8ea4eaf07f08b0530df3a6e04f09522ea967948faf91
font_02_sfnt_off0001389b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 17996 bytes
SHA-256: 41dbcbb9fe8e62acff8bba1b1b555b98f1199af0286b949d43129ba611431ed9

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