Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd38a38da23dfed7…

MALICIOUS

PDF

98.5 KB Created: 2021-08-12 23:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 21394a6451bcfdc39773d0112df22c4f SHA-1: 7a2fbc6403f812306e38d56bee1d43210797f3ab SHA-256: cd38a38da23dfed7d2c88236eae1ea8e9ab17cade021450a87e1b344148bb0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5785be59056f221a0b0f1d2159301036/49729259472.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6bc7c625a04a8ebec4372b328dd545cd/15755500777.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160942926e0c07---zugekomorikotadewoxotizi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/79288218736.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072422e484c9---xatuxakewavuwugi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/sonudududutaneram.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rarixadalolibipafifaxap.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/abe96e15453061cc5c5c65e082f75325/nelegigavozirikosodulot.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608445e76aeb2---59528969151.pdfIn PDF document text
    • http://simonide.org/userfiles/file/zatofevogofojajekubata.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/jegopezejuzowulunelik.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebad106b44---nabaxifox.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/latadotaf.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa04385ca0---88985471283.pdfIn PDF document text
    • http://unityproductions.com/upload/files/11088489548.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/47697802602.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/66439996283.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/mavug.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc45f0297---91891017112.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/87913422922.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/49434485355.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mlqscnnv7d713tpna4ageg3sgd/53932898655.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/pozigopibatidojijijupena.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lafuxuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=teoria+funcionalista+del+delito+roxin+y+jakobsPDF link annotation
    • 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_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 11108 bytes
SHA-256: 3973e1cbfbb070976a38b2c44f992feb1c8ce55f31f958f3b4e3a36fb9d0d1f4
font_01_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 18492 bytes
SHA-256: 0a1a78b4f6f00a9dc3d88e7944f6bf9294a388683a3a25a5a60ae52f2fbe6b34
font_02_sfnt_off00016b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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