Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37f8de7a4c99bf9…

MALICIOUS

PDF

85.2 KB Created: 2021-08-24 22:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1795c07016ee6f8fb1c2a3bbcbcd3c8 SHA-1: 64868df21ce3239b1483c6433fa80086f27dd843 SHA-256: c37f8de7a4c99bf9320507dd2ebdf2aa3751d7b66dff22fc844366c99b4cc670
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier further support its malicious nature, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://mn-lawfirm.com/box/userfiles/file/3040788972.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fd38ee1a3f0fa78e5b0af02c31aa555a/pufikosinaketotu.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/46071879706.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/9461334033.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2eaaee1d0729ab37db91f17b47493404/64548980691.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a175a475a53---39037610226.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/35398079648.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a61f5f8ba---nolozukapetepa.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/genulubunelorop.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/tazapisofizawo.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/tujijipa.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/98495559458.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a037f1a88---5004142424.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/befeloxonapidixasu.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/87198052545.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/xofavasiwikerenap.pdfIn PDF document text
    • http://fohow77.ru/upload/file/22083942402.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/gumapimego.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/88765119155.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072002e92ce8---bidemesoguwoseduzo.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/54753776501.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/38268186371.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fd41c98e76167d90755dd8e684a24c27/42267530847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=freedom+cadence+bruce+springsteenPDF 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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 22884 bytes
SHA-256: 0cf6ecd9cd94513c015e5296c63e489658c07028bee14c190333f26cba23ea7a
font_02_sfnt_off00012d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6F 11028 bytes
SHA-256: 68159559ce05bd283f0b9d3142e4544a5b480618699740f98effbfdafcb2afe2