Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f01d8a4a11db74f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 12:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0306755b68dc12413671d6644db1a7aa SHA-1: b285b0cae8b982732f4857ff3e71012ea53c443d SHA-256: 9f01d8a4a11db74f47aa0209898fc9d22d0abb32c53c526db85b6b801c81bc42
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or further malware delivery.

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://philabc.ru/uplcv?utm_term=www+office+365+login+email PDF link annotation
    • http://autostyle-japan.com/js/upload/files/pomenozoket.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/64113648715.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/dizirifevesosezutasoxo.pdfIn PDF document text
    • http://actinq.nl/upload/file/95623232838.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/butivorusenexoranolej.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/23839798169.pdfIn PDF document text
    • http://ud2-140.com/files/90520366989.pdfIn PDF document text
    • http://precisao.net/files/files/5485322224.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7f9b714e---lomup.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/jekabewasajiwiselowofevo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bec52e3a---35878772295.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/fivebizimedawarasavalij.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///donigapasufuga.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/loxumavulixozapem.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/6109117118.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/magikip.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614151424a9ad---bodijub.pdfIn PDF document text
    • http://ombs.ru/uploads/files/52725863086.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/37597252453.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/52461701340.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/denobowunisarise.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/6633732716.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/7922487899.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/zopumakibefane.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_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 10864 bytes
SHA-256: 92c1deb7c9033df2b4a7809e63e9962c2b17bd227a333aefa34bc532dea70ed9
font_01_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 18600 bytes
SHA-256: f01ea5fc5000e83a531f2cd8521e2a6b01fc66077ae67ddf5b48ca553cd847d0
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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