Malicious PDF — malware analysis report

Static analysis result for SHA-256 734ec10c0a730ebe…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 02:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1281f192f6ce6ddd422a4b87131e2c33 SHA-1: 9250f2d239810b0ec34735a47501476da72a48fb SHA-256: 734ec10c0a730ebea804de8d9efb0593ce9f400fa0d198ecd4e9b7073e9fc153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wroclawmodelshow.pl/ckfinder/userfiles/files/zajivibikusekawenep.pdf In PDF document text
    • https://pasarantogel.com/contents//files/sivuwabo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6b8ec5c7ba89fa0b4d650822bf1c1eeb/62196500259.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/gonov.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4b923ece---47099696008.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16104a7f743d66---zosiguxulebotizuke.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b65b22dc172---pakogadifodapedadib.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/2060535081.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/bopolafol.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ugngn1qtejpk3bk1kbj2q74784/babaxuge.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/46513394096.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089948bc3af2---tatopewo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075797cb15d7---pogiledotowipuxawiloz.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/davome.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/87844208030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=augmented+reality+appPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/1540478453.pdfIn PDF document text
    • 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_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 16420 bytes
SHA-256: 857d695b5e642bffc0550f62b0f732a08959fbbd5463b6e05b89585caae9dd4f
font_02_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 10644 bytes
SHA-256: 179719102c2861fab5d0d23ecb09e2859c634e8eadb5b96c5de92a54cfead737