Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad65b1d95410af28…

MALICIOUS

PDF

91.5 KB Created: 2021-07-28 04:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69ab35d323b4a6f4755cf8f030c6780c SHA-1: 913d6c329f5fbab09640446e5b94b209e7c3e45e SHA-256: ad65b1d95410af28c2e06b4a646b3d93dcabbf84da7fe3012d8ad62b6f06ef55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings suggest the PDF is intended to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5841

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 http://salon-urody-bellis.pl/images/file/wenesifejafevib.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/33755545826.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fed7babb---15292660583.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/wotolelesa.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/32e7a5ade6c98f80c388d4247a5143c3/vawutedani.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160994f0fe9c1a---fivozorasodobasuso.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/87281571289.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5de223d73---2793698248.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/78605924559.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/xupinatuxa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9973a9f61---suwozivifumozobupivugos.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xijoge.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/17jbiderovncrk5t4ufaubuta4/20206365648.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/nifumupudife.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9c49a4fd2012151a33648f0526b07955/67848642613.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7f2b070abbcfd4752f41f0abee7e3484/77401787377.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077022f4e1fc---vogedexulexipisejeg.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/83487629440.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/25d6c58d95844b7e0ca90a5bc261f74c/97448204637.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/9099327869.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1b37f4ebded64f9caa6ea8ac9ff593c3/79013276454.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/780e12518006850b5108c04a708fe9f3/dezejosatametewito.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ufcv3q9vbqoi9vdc6te59n7rps/pilokimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=olas%C4%B1l%C4%B1k+ve+istatistik+%C3%A7%C3%B6z%C3%BCml%C3%BC+sorular+pdfPDF link annotation
    • 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_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1