Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31461820602c55a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 23:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52acb00a00cc5770f347f499059e6086 SHA-1: 202e964c360a36b0abbc6bfc81e98e4b7faf90b1 SHA-256: d31461820602c55a0afc2bcc4f7a0e2d2125e444ba92a6d71a14fa554fc9a716
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these external sites, which could be used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=comprehension+worksheets+for+fourth+grade PDF link annotation
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8af66ee29e59aa45e38d431177e44ff8/67183692764.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/40043546573.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8deb9a5c02---fulaturarurusoxijoz.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/8140123722.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160822a11b32c2---lofufe.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/59927842691.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/jugoxidoxutufip.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14b6934c9---69947411914.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/248075e17676ad19c4083f9c0d7e8674/robuzutolivekem.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/kapazakixomonolutumixuk.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/zusakorivujosujilizuva.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/zuposetivowugi.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116d4606ce83---86408570422.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/gelekixuzolik.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/72747005099.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a8qkdectf601uv121qapv1fekq/xerapaboga.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/ramirifidojosokidetuki.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/wizukawudabedamupamofo.pdfIn PDF document text
    • http://eksternest.be/images/file/fuzurabudireziw.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/37071897597.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/614a0382d0c3da74a932aeae36fcd92e/samunofidu.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/falubududumomavopifuwel.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xokotam.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/87736296595.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/nivifulanefix.pdfIn PDF document text
    • 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_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 18456 bytes
SHA-256: 23cbf06f80be177a26dfd8a3a7750fc0596c803ed971bc2a344209cf88d176bb
font_02_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 11208 bytes
SHA-256: 95d4e7128dd003926ecf1c31cf4b0ba2c40a6bb6b2debd7736da0cc452cba6c9

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