Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13cd68c9bd83ab3…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 13:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 723928ae9a9754dbd41d1b5fdf874d02 SHA-1: 282b5b42421204301b38baf7ab457b93896fb3eb SHA-256: c13cd68c9bd83ab3601ca846a97201310a3e3220f3a9e32947f99333ef965338
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The presence of multiple embedded URLs, many of which are unknown or point to potentially compromised sites, supports the conclusion that this PDF is used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://epiphanych.com/images/file/gibuletisixif.pdf In PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/pemawafegajumiw.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8bc2e8b99---65406383245.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/77057373464.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1628960858.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/90174104692.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2k3c26sb49vi3evjhq4sbntno7/13016412462.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/derixujir.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2idvrmk0o2506fj4eia215ina5/piwedowilil.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/92694184463.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/tejuvu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/suneledaxunizexaxanifij.pdfIn PDF document text
    • http://gazetavk.ru/img/file/70721759155.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/dituriketitarela.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d72c457fa482bb3ffc58021f954822f2/93327085819.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b66bbef48---64488751100.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/dopinazesimix.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/4079188502.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/guwefowokofumopovekiva.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/78676585376.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a7388e24f---23457705871.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/58311106596.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/85634dcd2a858900ac1aab163d4ea9f6/67146390647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=englisch+stylistic+devices+%C3%BCbungen+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_off0000b65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65E 11112 bytes
SHA-256: c19901e1ddbfdd9cfe6603d42872189b32d9db9e07bbb12671b318ad9d6b69e6
font_01_sfnt_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 17176 bytes
SHA-256: 151b7f2427d6d555b61c77480168754fe3608c5c0bf64acf88fe1da15b8812c9
font_02_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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