Malicious PDF — malware analysis report

Static analysis result for SHA-256 26487a05dec4a51e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 20:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: add3cdf14e22aab0936cd593d844c63c SHA-1: 70dcdf2b4ca6886a5e5760dac8fb5c25d46ab3b0 SHA-256: 26487a05dec4a51ea47705e092de66f476ad10eaa4216f11bc588a578877059e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/40733060604.pdf In PDF document text
    • http://anquocrealty.com/uploads/image/files/21876532413.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/k6j8vaq5e9sivcifiae4vibdaa/fafafajegofosageja.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/82261455815.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/abadb2o8o0nan7og66l9le3kn1/busikoniwadudusamopudido.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/wepenudigawemaf.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/sefisobumakezixemobi.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/2135440403613a75d66ecd8.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/weninebawowadijolijigi.pdfIn PDF document text
    • http://viorina-deko.com/images/file/34660216238.pdfIn PDF document text
    • http://change4best.ru/upload/file/61826017360.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01314b97b---51376737644.pdfIn PDF document text
    • http://retailcop.ca/files/zidimewupeminul.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/rajixozama.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/fosekewaru.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b961a46e26---56307021187.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/96bdbfc0f811dbdbc3147b81c82e6b69.pdfIn PDF document text
    • http://glttek.com/userfiles/file/fokagimuzujeve.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/29683834585.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/40566947009.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/natajaleduxawem.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed135e46a4---31829332920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=design+of+everyday+things+don+norman+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_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 11080 bytes
SHA-256: 5e33e6b44cfdf09ae3e5e81d6e8f62ec4491ba7f70c017e0579d2ff46a87d2e3
font_01_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 17528 bytes
SHA-256: 451d81676e254236ac58e3ba4ace7b0382fd7e17d2c23b366d08031ffa2669cc
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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