Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dabc3adeeef880…

MALICIOUS

PDF

88.4 KB Created: 2021-07-25 19:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98b50bcaf3ec733f8c04cbb51ce0d7d4 SHA-1: af43867b55928b5092ed07c8ef03cba897c89bb0 SHA-256: 15dabc3adeeef88049e68248ec299488a258c8ee1273c614646b7e66458093b8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt at SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1c90a5f5---serurazej.pdf In PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/wilopiwib.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/37e5a98d5176285ab1f93e47a6bf009b/41101770917.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/2891307226.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7f78abe68d8920735f6e4ccd6129a785/medolujotote.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2a9d7cbf60773b6c57b82f1c57c6c908/zaranilixazoti.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/1hvc76g0l55r4n9mdasnkikekj/rubovewajafolevuzira.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/pubasekuzasufagen.pdfIn PDF document text
    • https://tavio.ru/files/file/74608269049.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ol0nvi1pvovdph8f8ib04tck20/zuxelo.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/63023519330.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160747f7bb4e7d---dedelanal.pdfIn PDF document text
    • http://aquatherm-graz.at/files/91854945636.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/26814468897.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d0d78c25c---fomakuresun.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/pubefawoxobijaveg.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac71c391009---wugenudamegomogojekax.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/22436346786.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa4d85ce6---vevivuduworapikamugidabad.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/nojuruwilax.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/57080981519.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/tobixorusubuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=english+grammar+worksheets+for+grade+1+cbse+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 17968 bytes
SHA-256: 25ca379e26b701d4ff999e0fef31f08ddd0c74e6f2a2b68ee8541dbc0b0cb84d
font_01_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EB 11420 bytes
SHA-256: 188fad6c7c0fdf690f60432fc68d19db735f3b3f05b06a71937d3521fc8bcd27

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