Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f7c92103583adb…

MALICIOUS

PDF

79.6 KB Created: 2021-10-12 15:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 20106613de2c6bea5a12bd3cb60965d3 SHA-1: 3642e6fa3e88e30c88d394654da76b0bfb4342cb SHA-256: 83f7c92103583adb373d6310c0b28958fca967b8b623bec8931644cdb8efd6cd
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.mezmat.ru/ckfinder/userfiles/files/13645902904.pdf In PDF document text
    • http://thecuriosityshot.com/97382492293.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/kujizabi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615c41d7b5208---dizob.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210926_264C941EFB1C1C82.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/80819600443.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/vitimanego.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/fibojo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614d669abc14c---mixasulufab.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/besodisosakes.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202110060926502141.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/todud.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/vosiwo.pdfIn PDF document text
    • https://phm.vn/upload/files/70967034058.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/wibirujunoju.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/88165740848.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161618c568db1d---39010923452.pdfIn PDF document text
    • http://zenithmetals.com/files/72407355077.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/gekofuvoxogepiwawirujebo.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/lujasadarosaluwe.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/nuwarifulusovopisupefok.pdfIn PDF document text
    • http://www.agot.pl/upload/file/wokukamikuvejogeparid.pdfIn PDF document text
    • http://man-shoes.moscowfashion.net/content/xuploadimages/file/78663298244.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/kixesux.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/22393482024.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/87577011910.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/8400325376.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=the+pain+due+to+sciatica+radiatesPDF 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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 18176 bytes
SHA-256: 91def8d0008709f65cc6e46ec5fd0b0dcccbed6b41ad337e9be805adb04a47ac
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 10628 bytes
SHA-256: 3b987815e58d8d1bfd206ce2dad9844d36221c6901307b3823fbc3243d8b0f31

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