Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf376f66e35fd193…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 16:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f53fe15f74439275167bfa5cb2dfc86a SHA-1: 6a5ad66df3d4de9c0adb6595e5df7042353b6e68 SHA-256: bf376f66e35fd193c51113623e693a0cbdd044db136cfca19c6b7bb811c9927a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript and the nature of the external links indicate an attempt to trick the user into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ms1oke.com/contents/files/gederaderiviwogawev.pdf In PDF document text
    • http://geometracosentino.com/userfiles/files/beped.pdfIn PDF document text
    • http://strap.sk/uploads/file/leviwudopalufalag.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/70017934153.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614512726cd02---videb.pdfIn PDF document text
    • https://castel.ro/userfiles/file/muwadita.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/95226515314.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/27141162268.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/41454433320.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/wosawuzugesowukapibererax.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/65762497254.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4c60722a8e509d5a0052a755c67bc836/nasotubuk.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tekenugajubol.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74996005871.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/42670470526.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/45706634234.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136387a993da---zakude.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613515a529df7---9114570153.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/tanoboxebogogezopawa.pdfIn PDF document text
    • https://pellevah.com/upload/files/laxawukalujodipuxijesopa.pdfIn PDF document text
    • http://peoplefoster.com/pliki/52183517255.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/92000995790.pdfIn PDF document text
    • http://nktrading.qa/file/files/39207841826.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/ponegedegebamafiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=duplicate+photos+androidPDF 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_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 10712 bytes
SHA-256: 60ff6a2c4a12adc2059a23cc773c51f49db121e97e3a7eaef212201b8769a800
font_01_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 17660 bytes
SHA-256: 8378039218e7a27ea8287712cec138a51d120819d1c81ad5cc5ec4bd337060d4
font_02_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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