Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff69b303874bb7f1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 22:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9dd72465779eb74a6d78fc61898062b9 SHA-1: b2672418470fe028bcaafb212bd7347ebf8fbb8d SHA-256: ff69b303874bb7f11d7d5dfdccacfaba5f7c0316ffd97b22e8ef6c9beac00897
124 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the PDF structure indicate an attempt to disguise malicious activity as a legitimate document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4123

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://cructi.ru/uplcv?utm_term=volume+and+surface+area+of+sphere+pdf PDF link annotation
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/fscdnjf0pmb5di933qhmbr9qd2/zedufoguvenofibuvi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/74497785183.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//norofifulaputupu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e54095beb---51824052202.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/43876157072.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114511fa8fe2---goxidimawulomo.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/14585612614.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/pewidinilabizag.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/lavabafu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756983a7cba---tisadelibibijugasurilo.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/boniganetapoxujejosusuzeb.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8415004eb---42860150518.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c868c6c57a7---duxudomilezibitunajudej.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a990dd1180b---94713852126.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/nosipus.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc117ac64a7---13910717968.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/95767253977.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gnk3snkk64l8om953br8nebgus/punoj.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/50435932240.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/jisanikesilugufurinimelu.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sutetofu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9eb96207---86555422070.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/lesav.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/pokaxigesujedados.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/65061610804.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/gakevumopuwisabobedib.pdfIn 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_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 10764 bytes
SHA-256: 2a17ed2606b888b2cc9bcdf4214df8238c7d41b3050caac0a4d5b621298a349c
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 18548 bytes
SHA-256: 5da8d5f6b8b381840375db661ee91f50631e6d529624a20e942b34f8caa26d2d