Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52dbc02d4ad6444…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 10:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc3411787ef5cc7512eb8a68755d2b90 SHA-1: 324eb101debd265e9bff4b659492430f2047736e SHA-256: d52dbc02d4ad6444e6442a158d71c5dd9f416bc91af34f852994c8f493a9522b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. This suggests an attempt to distribute malware or conduct phishing by leveraging these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://speakingaboutnetworking.com/ckfinder/userfiles/files/nojuromowivowobaporevebul.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613024fa16554---zitoxaxuxudiku.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/66793613038.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tawerumajojum.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-21/20210921042233587142.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/3812341468.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/16168558994.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/62035285959.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210922171418.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0m121r6ud9n1fkfjfvj1lchj2i/mojelavutizalitafa.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/tasegaj.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/48118384772.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/28713211312.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e209b04593---47785014678.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/kopokojivanerisopojemel.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210905145344.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/rogufaji.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/78946831889.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/44921884343.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/17853740243.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/donadesoku.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/94754846786.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/wokosesiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+clock+widget+android+2020PDF 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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 15856 bytes
SHA-256: 6ddf15be93222e90c4571d1b4a92547089c4f0335c0da20acb881baff07fc7be
font_01_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 11016 bytes
SHA-256: 43f2d5da548007d850791c60fb9ea44033712cc60671497cc7cbf5bb6ef824bd

Open this report in the interactive analyzer, or submit your own file for analysis.