Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace19063c8b2b8ca…

MALICIOUS

PDF

57.0 KB Created: 2021-06-25 01:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b570d4962c6d4c65c972b0d11869880d SHA-1: 9ba0caa01a8c79c6cc9a69aeae6ca79716281351 SHA-256: ace19063c8b2b8ca821985d7194e01fd40cc6b37e5b69a29b6e9d617f924105e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 5

  • 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
  • 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://mg001.cn/upload_fck/file/2021-5-15/20210515114623741464.pdf In PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/73046232567.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098998edfb24---mezibemevoboxi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sotidizexu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535ea0dbc9---nonepekidovijorese.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/varopujasajozunevavobo.pdfIn PDF document text
    • http://jump360.co/upload/files/20210624212915.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b232615cf65---nanonavejuvogexofebexedel.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s7ks9mnl4tp1lhcetscpuo3kpc/mikeziketuveler.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/tetemedukibama.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/9jckngvl0vtdbgcm6tuh3drgi2/96814381370.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52a5169c62---wiromag.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516003321156197.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/nuvipelebakefala.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/7412480512.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/44135707744.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/hpks9t7aponh3lvkuhv3to6omj/99867978905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kiralik+ask+english+subtitles+episode+6PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 5548 bytes
SHA-256: 943a26947d5a871c502544b7593f5dd61d1b23a7dbef134b58a5ced33f7d96a0

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