Malicious PDF — malware analysis report

Static analysis result for SHA-256 817d41a1196abe9e…

MALICIOUS

PDF

96.7 KB Created: 2021-09-22 20:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c03c60afe0783aea6a600a1872e26aa0 SHA-1: 42a4f285e39801576749535be4d47b62609ef962 SHA-256: 817d41a1196abe9e5cf0acae638178a357dd12acb15c659927594eff78a650f2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites, including one hosted on a compromised CMS upload storage. The presence of numerous links to potentially disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://maximatrimony.com/ckfinder/userfiles/files/safud.pdf In PDF document text
    • http://vinhthuan.com/upload/files/53396617844.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/dajewapakogaleletapexep.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jimebij.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c417037c---wujebuferilekabifivi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/cmmmqj372as4hc13m6f5b54j2e/96995129618.pdfIn PDF document text
    • http://nensi.si/upload/file/zomogobapokuxaveku.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/98070723075.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/28063809569.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/xufujevusef.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/ziminememiwobivixowabite.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/53122937431.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/basejanuzumobusiraruvu.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/16626523986.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/68433f5fbd7464c05954a97fae6dece0/xivazibigedozivejika.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/17454546492.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/pisotevivopin.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/nirosirozatesejemanoka.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210920_D6F6EF5EBA87DFA5.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/popozijijirimarinibakutip.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16143af0173a78---xedibamepitawosibon.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/17515519344.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/70937585933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=katyusha+violin+sheet+musicPDF 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_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 17896 bytes
SHA-256: 1e1f7b13700bd6762fb3059f790e67ca54e2df1169b69accf32ca62c1485ea62
font_01_sfnt_off000144c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDA 10664 bytes
SHA-256: 74afa6cdb1ce9c3d8aac0c91ff342a71f4f6f0eb58fd918b277bbd0be98b9d03

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