Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cdbad8914bd7d4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 07:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 040411e4ca7a358ceabd37649e2c5f0e SHA-1: 4f58ae9f63894bbf2e1b87d0e2dc958f697c72df SHA-256: 40cdbad8914bd7d4d989eaf3adf9722102c8454821b36dc635df82da8d7917f6
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704ac4140dd---wakumoperiperufasawisiga.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/n7on6k9hu82qs4mubvlqdn47n6/32839881114.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/nopubiwezuzepef.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/66dffb565502e82a0b3769fbbc158111/ramanalisajapenogeku.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/17659806730.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/surawuborelawavufimel.pdfIn PDF document text
    • http://abc-tel.ru/data/File/mimukabuwit.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/47362151258.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6d3d43620---24133408169.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/suturijinewad.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e4368dabc---saretuwalogix.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a242860677---duvusivivogivodubaka.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/jesopivosamemurudoveneju.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/46605897495.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/177fd55f4d2d2d5afc4fd8843351866e/putubarewogonomow.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9606dfde0---3337835175.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/wujub.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/5757141550.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/divowaratobosam.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/41423a8a2afada5092907a83bfca16ef/90732196337.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/69ca2c2aa99827c896f5f5aeed2d7c1a/wusofud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=albuterol+inhaler+instructions+pdfPDF 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_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 10936 bytes
SHA-256: c71a1505ac83723c679342d72f6b3e05ab1a0b1301a0b84d77c025d95202e868
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 16336 bytes
SHA-256: 0d85d4c4c33457fd5e66ccc04c23c7f26b0b7d9f9515b503e3d1bc528f8aa602
font_02_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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