Malicious PDF — malware analysis report

Static analysis result for SHA-256 873b1d6fae42310a…

MALICIOUS

PDF

91.5 KB Created: 2021-08-19 00:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 416317f8507fd3cd050a3229337255a0 SHA-1: 2eab0ee42ed325c61d72f69c2ba5af4a599c4f1e SHA-256: 873b1d6fae42310ae1594623c298a8e632d7f1a8da5085df9d9e165dde278147
124 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, including compromised CMS uploads and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The file's structure and URL distribution indicate it's designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3693

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://www.hydro-tg.pro/upload/file/25940101069.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2bc7901155e9905663d908378ef2ca7c/12516913461.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/39343774337.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/90936867454.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/rupinutebot.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/43389613774.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b109dab---wakabinugedodafisageb.pdfIn PDF document text
    • http://riversedgefm.com/files/file/fomakimi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a71474ec---97399253509.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/779cbc59843fef62baf09768a5d18153/butojixoge.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29176430102.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/14478257333.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/91fbb8ce2b49c102f2b7cf918b8bd7db/14117471782.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/pazuwavunoretadavewipav.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160833e51989a4---karumanobumagibagetuxuxa.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/77403288183.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106da89d16---rotovaza.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/34318795496.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc4df2ec---bakivenu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c61b2630---vunoperedixipe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k38cjl60eqef41u5tcmrsbnvj6/gexiruwosifezomip.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/bodowumibigotedasa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e9f126ba---57032323065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+figure+out+simple+and+compound+interestPDF link annotation
    • 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_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_02_sfnt_off000134e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 11140 bytes
SHA-256: 9386e9175b2ce4eb6351f58aaba21b25b7ba5509b958fcfc80ec59552355d95e