Malicious PDF — malware analysis report

Static analysis result for SHA-256 24be82974825ed06…

MALICIOUS

PDF

86.9 KB Created: 2021-07-31 11:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 374bf50755bd6bb428d633c571ee48fa SHA-1: c1a8bc48bda4f1e43e0ccc26c00ffce9104265e2 SHA-256: 24be82974825ed06314d476be1aa3b4c7ee58d9dee990ea93519a81259fd5b46
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users into downloading further malicious payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://juniorclublivorno.com/sitonews/images_upload/files/maruberedadenuwudane.pdf In PDF document text
    • http://alliance-ltd.com/userfiles/87563499067.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/botibokaz.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59ad5ad6a---lipetamegizututadobebe.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7af72fbab21c00e70c42a43f85fc640e/3372477476.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7h638p8btvim7t7nl43ulbovc/jifapoxo.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/kesadinavawuvomabegufe.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/sakavonu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607026956cf81---13294033125.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3697040925c54d719d61dd4c37ac481a/44833872679.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/buxokidowosele.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a5719e88ecff13a23cf41d7e297ca64a/nafidavijawa.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/faesd0g46jq6a01440k66rbf2q/xafiwasefesalevube.pdfIn PDF document text
    • https://atl-50.com/files/file/13098467100.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160804ab4e3506---94723338208.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210708_165118.pdfIn PDF document text
    • http://come2menorca.com/images/file/lepagugerelelamip.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gakekanab.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/8vr146honbavapcqinu2apv266/xuzeremezopaf.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/22525961185.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e951ebf40---xosuvepanarabolimiditikoz.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4f7229dd20957664ed6dbab601eed581/42955677344.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/mofij.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/69c7877f4b382cea460f4e0dcdfecb8c/moxezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=is+diffusion+active+or+passive+processPDF 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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 10684 bytes
SHA-256: f283d5901cc2abfbf9d1b9e774e0cc59648b39ce42deb243ec8fdd0f9da2fd5f
font_01_sfnt_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 17120 bytes
SHA-256: 1f98e6966c30fad09edfd8dc2c417c8e82921f5609059c58567aab05a9f9323f
font_02_sfnt_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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