Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db36b0485ff3100…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 15:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a693bda3c1b45bfa23972c132375c2a3 SHA-1: 290eeb80d1da995a5f8bed50df94b77527680b81 SHA-256: 8db36b0485ff3100e529fa7734a3ab3a11092fc8d9f1cafafc2dd1acf555a183
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on compromised websites, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ad7bd585c---pamolibek.pdf In PDF document text
    • http://platcometals.com/images/file/68743483643.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/68814053233.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d1c8ae37cc543503e26a9609b395d5ad/9565891440.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8320e8b27b9e2daf9fb69dec687f74d9/35919580626.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bo80ead1frbhje4k7fn86u5457/wigobosod.pdfIn PDF document text
    • https://langumeistras.lt/i/File/pugutunedukosirivo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94b395c70---siwurelugetuta.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/tadufimiwape.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/62257080793.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ihoif9dg215dhkg8paraeepdp2/20125623402.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/63140523740.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f79bce1bc---memeligas.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/76bd50142242d2bb01db8d59f32d3fd5/41310358073.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/pg7mvrc3f9lrcgu3vhfkbkajah/31922175576.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/97022851652.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a40fc57613f---korilat.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/61147363982.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07b084024---bobosanetorodefave.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kadelatijubetutadetolemo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7594164c7---53800218729.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b0d09a29---musowopegaliki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dsm+iv+pdf+espa%C3%B1ol+completo+descargar+gratisPDF 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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 20776 bytes
SHA-256: 8ecf9849049a6879a029f4ac84426ac08d70595df1e967a79445a8cce6c291c9
font_01_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B3 11132 bytes
SHA-256: ce8e5b2cf4de6d1a965c894e36df741725ab158dfb441a540e25b0a978ef0608

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