Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e3fef1b1ec8a97…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 20:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c454fd3944d1cd55df4315991c76d67c SHA-1: ae3a45fc3f581eb954c22c6aaefa61ede4e70fc5 SHA-256: a6e3fef1b1ec8a973c5d6a0a635cb72d495866a114c487241c2d4210ea39dead
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm designed to lead users to malicious content. Heuristics indicate it's a link farm and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d231ddb18---87731775394.pdf In PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/89626699448.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/40648624924.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/83573477678.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/89512875726.pdfIn PDF document text
    • https://vzglavniki.net/data/file/48924524411.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608577f6b9b36---15831693156.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/86468460933.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe27cf292c---6827736586.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/44779058146.pdfIn PDF document text
    • https://room12shio4.com/contents//files/medexonikejujebixe.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/gufofatuboxowi.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/77613600565.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a07a7d556370cf604d4aeeabe1ac5ef4/bavevowuladar.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/fosexulixuwawokuwevo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/14592714005.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gonison.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/07/20210708181942.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/wonuj.pdfIn PDF document text
    • http://wuchem.com/upload/files/javoxab.pdfIn PDF document text
    • http://splogservice.ru/content/file/95416516077.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160baab4549ed7---vosarulobemalinadonidore.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/lisibowiraba.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117ec70a8bf5---xasilawizax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jazz+blues+chord+progressions+guitar+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_off0000bae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE1 11188 bytes
SHA-256: abf24a08592a4d51b9cfce7c0f8251b4fd6fcf1b4d442607c949de1d19831fb0
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16652 bytes
SHA-256: afbf77eabaf6e2f83832209a86da99b898ff207830a4020422e756d6c02de861
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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