Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c123e264dcb85a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 10:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53dbd0ebcb28dcb162c1c1998f38c0ab SHA-1: 7f33d13001277fc502b87b0aa258473ad38fc87f SHA-256: d0c123e264dcb85aa64fc0358b91ddf2b5963a3733d6964f8f40a02a851bdcfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further payloads or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3hme4t2u7doqa43a2qnr6gdij1/tuvenu.pdf In PDF document text
    • http://www.farmaciapenil.es/userfiles/files/detisaxijebires.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/69984368352.pdfIn PDF document text
    • http://fitviewer.biz/files/file/83026691926.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/muwudegeduwafo.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kevarogibazaxixakuvifim.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/80625964682.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/68328073173.pdfIn PDF document text
    • http://headrepublic.pl/images/files/45676461205.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/dixej.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/38917741613.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/50847214015.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/94697255913.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614728af368b4---wafuxagizedatawijijozin.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/29982419783.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/dalufopifumidota.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/80412997820.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319b14d421d---fomurojivisubugofibedeb.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/lubexojoruserofad.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tivirelefukenuzunexoxat.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad24b9bfe---60993933926.pdfIn PDF document text
    • http://kit-veron.my/ckfinder/userfiles/files/23777582684.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/mesotime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=en+mil+pedazos+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_off0000bb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 18768 bytes
SHA-256: fc8e207fb7cef7c24adb43bf0b9fd3ad6ee98bb39b06cc7873bf36991c82eb76
font_01_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 10504 bytes
SHA-256: b1958e2933aabbf4f577063ed37cd2758d725244a3ba57e4afade83abe3f7a51

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