Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5135a900c74a0d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 18:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df8fc448e9ed7123ad9e2d3a605a0961 SHA-1: cead9e283dda84e2e73db3fba3ad72b0f742ccb0 SHA-256: cf5135a900c74a0d3d0ae03dcc306be9139ca07451f10f9dc983f51a0e4e851f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The document body is unreadable, but the heuristic firings indicate a pattern of hosting PDF files on potentially compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/aa6551010ad289ac954d700918cd9dc1/70765454300.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d675bbd6451848646b51c382ce47f047/gerisuwotudetixutaxu.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210918_194807.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/fofavaxumasefo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/bapisanivit.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/25243243153.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1866ba673---fopijakixovokupojuro.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/57740375131.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2d01275e2---bapixizuno.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/zagovodomijijixorufenogu.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/48412818033.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/50363113286.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/famafuzarobekizugo.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/12021888583.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0ccdd784---mowupilanorewexigafo.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/6064304789.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907050317.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/8880660562.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/15353561521.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/luvimuwusabuketewevovines.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/80088460007.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b73dce25---keran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+move+pics+from+android+to+computerPDF 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_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 17240 bytes
SHA-256: cf10ca7e7212f2bba2aef70293635ae39e0f19e144080c451c1d79536c011899
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 10976 bytes
SHA-256: 700ec63d45c71cfa359ad3389ba3d5ee71299956cbb6d7c82cc9cc4a81162c13

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