Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d9990a8c7d8782…

MALICIOUS

PDF

77.5 KB Created: 2021-10-03 23:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64ae47ed8dec1510df3b46d6d2852275 SHA-1: 0428d5d73b5fd04f175fb06c250a6c2c9cba0308 SHA-256: 30d9990a8c7d8782560492f0d4b6640b11718c49a85ac82080e7548b6e3a18d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF that contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The PDF structure and URL distribution suggest it functions as a link farm to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b99c67db7---sexixenozamikuxasilozuf.pdf In PDF document text
    • http://wmasgroup.com/userfiles/file/gidudesujanifisepadowo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hdvi5j2m0uc0bvnu7r8ghb0ij3/99620007185.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/potavitapabu.pdfIn PDF document text
    • http://ausietech.com/images/file/mumewesubak.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/wuwaramibumobubeluwo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/kujagudagalaniwesodob.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/78540296995.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/84073729628.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/luneviwisasakimifako.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/17622052458.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce5a511fc1---lebabagumaguzezesewejeva.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/tanatuwedukojivusumis.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/mexivos.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/kupuw.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/72280673974.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152d937800b4---52512425340.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/vufibuwuruxudato.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/2135536834.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/dinib.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/89943345610.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149365002e19---37612021529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=shirley+jackson+we+have+always+lived+in+the+castle+pdfPDF 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_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 11280 bytes
SHA-256: 8e09ffa50e28ecf1f55a3cc049f24a6ebb845b6cc25a87a37364deb95e6948ba
font_02_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 20784 bytes
SHA-256: 29b79a359ab1cea55d1734722c0841adccd045dcbcc43e656535e2c572c7fd9c

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