Malicious PDF — malware analysis report

Static analysis result for SHA-256 e312d4dc95a8cab8…

MALICIOUS

PDF

94.0 KB Created: 2021-07-08 10:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 369175cdd8620852b844a5aaf62366d6 SHA-1: b53a24a87de5f098668b973b482ae78ef5997f61 SHA-256: e312d4dc95a8cab8005d69bcd748ced64c6eddb9f7a1947f8045fa910100e281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b35465eec5ba359a87b7eb78a1d5005a/figawogaripetasumifamon.pdf In PDF document text
    • https://fallsplat.se/file/lenodinakixabofafom.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/967f49188c93cad9bb09bdb989e7ea99/nefag.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/xotow.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608502d66ecf2---purutemewejak.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/67493219786.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160932626f176a---8089033888.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/95516467146.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/n267b6gkrlif8b7hmjd41lo4o4/nuxofajusilojebulupidag.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/wigera.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0515a5cf---kepen.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/64059759494.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a12156a1a6---83409919596.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074617123e73---37538748432.pdfIn PDF document text
    • http://canadanur.com/resimler/files/weled.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad1166406---639549746.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/083921b90b2dea0f1b59c9e67eeb30d5/denemolononemero.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ed2543d3---zifemafuvim.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/m1j1q90ja1d9g6141pvbolj4e7/valenison.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/872589e21a8817b116f9fca34ebcf4ee/59056860070.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/kulug.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608083a95b31f---96209244218.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/60f975457b4d5527e235d6a07af8291c/12566177786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=geothermal+heating+installation+costPDF 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_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 10716 bytes
SHA-256: faea174a1402d60bff051968131fbde34216f4837dcbf9370f04a157f1db633e
font_01_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 17960 bytes
SHA-256: 5fabd4af3ffd0044196451088c95190d66852bcb9398047b34a34b5f454cc41b
font_02_sfnt_off000150c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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