Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a047aab1bacc03…

MALICIOUS

PDF

54.6 KB Created: 2021-09-24 06:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8f2a7de2c2c4edc28ba18029ed711366 SHA-1: e56f5b57a6ead8d35bfadc008006faae48bb1376 SHA-256: f9a047aab1bacc03ce418cbfb9296cdf0bdebc1cff18f4a2a01da3cc1bf6aa19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'utm_term=run+shell+script+from+android+app' parameter in one URL further hints at the potential for executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8712

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://irlanc.ru/uplcv?utm_term=run+shell+script+from+android+app PDF link annotation
    • http://ephtour.com/FileData/ckfinder/files/20210908_D7AD71B92DB77C6B.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bosewe.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/37828869529.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/mirusixe.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/35245351269.pdfIn PDF document text
    • http://iknow.pl/files/file/8172966728.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/43551601877.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/24215476348.pdfIn PDF document text
    • http://elma1.ru/!upload/files/90659092016.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/61357032914.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/40411396388.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161443d926eded---28787843525.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/rinidolewirafotim.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/vilimorudid.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210913_7D3AEBBA7913F8E0.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/76315182976.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/pifitevujurerisiwag.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e112adaa6c3923f6091f4bb28d5c7236/menulapufebapuxelem.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/wupuwekavuvujojivexipajiv.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/vazilujojarubowavu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397b594978---xupizosoruzovu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7791aeef5---6924125792.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed38617c9c---29996083848.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/tulasimokenug.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614411848c346---wopuwop.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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