Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bbc613da420eda…

MALICIOUS

PDF

87.7 KB Created: 2021-08-15 00:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29e6cebcb676b93da4f8c6eeffb0e4cb SHA-1: db4304b6dd703d9786017402c33f282b2410b830 SHA-256: d5bbc613da420eda878e6c73ec635f6993052ebc0d1ffd9704b5dc6800ff1b02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Additionally, numerous external links were found, many pointing to compromised websites or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/puxidazafajamud.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad128cf80---wuvixeno.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520072550708853.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed28407cfc---94567258982.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8f1e369caf445517914266a624de29ac/37641283963.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/17266161164.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3a2bdd78549cd51772b976dbdfa6bb70/15240962440.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a99a49eb879fabf3d334a3f7fb3cdd60/bozarutixelopaxab.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab320c2f19a---68504168070.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/16104698816.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/fabod.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/dalabow.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/46550565555.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/42520846574.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/53336164894.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0f72b1d19362f830a55dd350501d5c09/16679571823.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/67429202150.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/beronopepogezikeke.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/47536967887.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6bd04fd114e0ee8ea0af649a19c10ae8/76510227665.pdfIn PDF document text
    • http://www.heksan.com.pl/file/75421326057.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/84979458765.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e7f9937f6---gebawajata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mulan+2020+full+movie+online+free+englishPDF 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_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10964 bytes
SHA-256: f3df68681cbf75b129f832f39ccbe08ea2847bc784f29f3b9dfb27a3d521649b
font_01_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 17056 bytes
SHA-256: 75e2e5b7e832275228f04373365b93a44303296f94918c46f7c3dc4dc00c7db9
font_02_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1