Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa88f53ab7f303e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 16:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06c0851aefe17be44f9c47671fed54bd SHA-1: f098b4a25be7f0c4c51b2e4581f79399bb4acc6f SHA-256: eaa88f53ab7f303e6e6bc24d4f2d53c3349dd9caa19c8105d8fff2f1a4402a47
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

Heuristics 5

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=how+to+override+pin+code+on+android PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436d8325dc3---37396502478.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/4543334229.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/51325881375.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e9mi8ud73npcg1co39obnc4eo8/wutoro.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/69979769396.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/18028394747.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/danisumo.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/14932933512.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f5a3c89e---wodaxaduxomepogo.pdfIn PDF document text
    • https://birotex.rs/images/files/96229536543.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq88or1ruqg8vuo8vfc0tv045g/81201701559.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/gofubelo.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/38039692216.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/59883480942.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9eea67526---wexobot.pdfIn PDF document text
    • http://acelybio.com/upload/files/zofazukimesak.pdfIn PDF document text
    • http://land89.com/ckupload/files/taxareta.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/57871208643.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/xovopegada.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/83415581175.pdfIn PDF document text
    • http://telecycling.org/files/file/vajagajigakodi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10436 bytes
SHA-256: 478f832eec19cd46084390c772285713c5a6a3f8c0622cd021b528f5d5f4f9a1
font_01_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 17396 bytes
SHA-256: 9b84198b3615625c312ed796e2cdaf53d9178cf97d486cb8d809c43a106d9a6b

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