Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d40a349e0fc86e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 20:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 036bb07262969a4c743c2df26d530f1b SHA-1: a321911eddca2f4b31e6370a4e118390b076e915 SHA-256: 73d40a349e0fc86e042383153180fe38abff9656104145326ceaf6a680d593d2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to other PDF files, many hosted on compromised CMS upload directories. The ClamAV detection 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d48fcc35955---86203477743.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2d067bad64e42849eae6dd1f5651954d/xipofabixuriw.pdfIn PDF document text
    • http://iccarrentals.com/files/file/82051537255.pdfIn PDF document text
    • http://e-sheremet.com/img/movisaxoradixisi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0873f29f9c553a3762f71a155384807e/40097678732.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/28vj1kmiogua3ggpcv0cqb1e7g/gozivutexunukuxalut.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/wevogukiwo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/95cer11b0sjcac391somu3v3oo/49597204254.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/wavitegalamejibofegipix.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/5116643051.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87c910991a---85876311548.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c9bea487daa4e0a875167c1ec8fd6504/79258801498.pdfIn PDF document text
    • http://arslanemlak.com/E/file/64153108633.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/miduwaluxak.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/56326198037.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/mutilogu.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/toredenupamoxu.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/5918186965.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/pezulekikepogoki.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/39075225703.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/63218434903.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210611100703_2b8blw.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5cc233cb67ad4411e2bbf4f90f99bcee/61769104440.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/69321652946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=community+action+plan+example+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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 16784 bytes
SHA-256: 39704ae26c1bf44dc692197b796d57ff271034ff86d8d46befa67006d42a0928
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 10860 bytes
SHA-256: 943e8123be9be21d334b539a162ce3fa8efe9e3670ca31f0fca4f5d150db6efc
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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