Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86d8fbefe658b37…

MALICIOUS

PDF

87.5 KB Created: 2021-07-09 21:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b56990c077aef2ae61527afe472f20f SHA-1: 4ad4d74e6440ad454a552c384151d8951eabf2e1 SHA-256: f86d8fbefe658b37ef08e2dcfe7327786b5e768b738418b6a6dc17e25e758fdc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aftckwt.com/uploads/file/pupexixipa.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/seta64gn11nj9m6m44nnm0pcq7/63427297697.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d533e60dbd---fasuxaxanifetoralid.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ce4133cfc---47336413568.pdfIn PDF document text
    • https://aneri12.cz/res/file/85766418699.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/50478433077.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65497a7284---43082722700.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v277a02ecfblu0ro0b0qqot259/mizovepevog.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/13167804255.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a3b313045bac17618ce508a6943da98e/66343278327.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/genivutemumepojodi.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/wekazawiraderi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988bdec0d7---tudafum.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/lorerobasip.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/budar.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/16549160980.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/78483080786.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/16545969942.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16077f75acf4f9---niwuvuf.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/27351057714.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f3c5558ea---borivosogasujopifexasa.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/443706192c91d7618a3350c55ec93f52/32643978364.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f72d454c52604ffcf95e30162f08df43/61310358185.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e06bc8d35976b97d1eeeed2db60573ff/sebutefad.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/30143227868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sq+to+hectarePDF 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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 22564 bytes
SHA-256: 0a31babb2523b7acaa4ecb8acae7a548acc4e4373f6983a5be834722eeaced55
font_01_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 10136 bytes
SHA-256: bcb200dbee10cff01d68a2395becc4a53d9cba9dd31830069c39a5f8346d9047
font_02_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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