Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf141658f5e44044…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 23:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3e2117e4166b0aa15261a394d6489f8a SHA-1: 9390b54cb0038a45f6b8b92e62798f3ac46270a0 SHA-256: cf141658f5e440443696b92652d9f89699187652dcd42d2152b0196b568f15b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irepairplus.nl/app/webroot/files/userfiles/files/sasakevokorexarikawox.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071814c205fd---58852956001.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1ea599467695a5af34b1c643856c0f79/fudokogojuzesiwejekewasuw.pdfIn PDF document text
    • http://yuha.be/_files/file/nonifitiganinolopar.pdfIn PDF document text
    • http://haki.vn/uploads/files/67123167617.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9581e4d45---66799628490.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f56f5d35da1d9f1d52f6aad0c81e7e04/fogivonedozuwo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/43128589232.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2107132029047248435hh0ylwfcn8r.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc3e9346f---8159910194.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/kuxopizawomof.pdfIn PDF document text
    • http://santabruna.cl/upload/file/wetodufavewoxikafa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3f831c1e---20319322797.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fimonawazamuvavirud.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38a92d922---begafi.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/sajibixekikonotenusubom.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/52536781976.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/80285798102.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/75825027891.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/zadujubufobov.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0d982eecd3e555db1f40a02ed7e0f19e/nelow.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c29d08bb9a50282374efa226e0a7a597/duretikumosonusubekome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=html+bangla+book+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 17612 bytes
SHA-256: b2a59ed122119569788bc5842c9bff5eaec925f9cf2e0e22f228c6f2c6cd6e85
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 10892 bytes
SHA-256: 2a50927358563360166b0c3287f4234b3095669f28c7cd2a8acf7340e17135a9
font_02_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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