Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8509a4dc5403a1…

MALICIOUS

PDF

97.2 KB Created: 2021-08-07 03:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0864036c0d7a62574c7016ab4169d25 SHA-1: bf63441da2f682f0753b767c0ba21a57a3d91e21 SHA-256: 1c8509a4dc5403a103113a280a858e914d7d4c03830da3c3ff0d187d2dff4939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads, suggesting an attempt to direct users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f1f7e701809fb9b825c113d98307577d/63703818109.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a52a6bda8---54541517475.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8568cb84e2eb5f830dc75f7fc0981866/guguvevetomigazosutas.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kesakotufubafes.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/6e8dfb957af7701ace2d212987d979a2/nefobesofifigiwitomiwofa.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/40209758680.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe134e01d---jewazakanejevazemaxifo.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b5428b96f4c95c418e9b03921d105d2e/28393179230.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7a680134---godenalamuk.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/co838177png00cgqfqh2npsmii/93055029279.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/66957636463.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7c1ea54e---jodoxapunumako.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/59699052142.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ol5dh2l65jr70sutufqs0dket6/xuvibasalivazivujobedore.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/90057063209.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/polutenuzipejope.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/3005510566.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5836a22f22314947a16986db77a9a135/xizopizujujajega.pdfIn PDF document text
    • http://flirdining.com/uploads/files/vatepabadute.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5e4ad6d8e2352b5ff30a3a167511dde9/12624462927.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/jilodujezasolusutil.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wajiki.pdfIn PDF document text
    • http://chieucoingason.vn/files/sojarilex.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c906ec5---nofinidudejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+car+loan+statement+from+hdfcPDF 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_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 17376 bytes
SHA-256: 42f96e6e6fb781d7649554a0d72f99d9b2bee924babe656d61d6a6cbd71014a6
font_01_sfnt_off00014346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5D 10908 bytes
SHA-256: 8edd1b1de6d220815cd5eb12ab3330ab8ddf8fbaf3f30c2c527142d8c8aa20d3

Open this report in the interactive analyzer, or submit your own file for analysis.