Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c787ea95bd6191…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 05:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 046293e7bd551a03123055e682db761d SHA-1: 92b46cba3fad499355d8c3e5f991906266c0bec6 SHA-256: 19c787ea95bd619153a4c9367bc053854629b7149bba8443c8ef3da1c5bf960e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to leverage these platforms for malicious distribution. The primary attack pattern observed is the use of malicious links within a PDF document to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://turnyras.lt/Files/file/xapapa.pdf In PDF document text
    • http://yangpupark.com/uploadfile/files/gorixalex.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/mobasobatisisiwi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d452768e---58037201938.pdfIn PDF document text
    • https://migger.dk/userimages/file/bagizaribifolederifulupag.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/duxogubudopujibomofipeno.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0spbvrhdoj88s4pdhspd23mtv0/wijesirejitik.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/92219289085.pdfIn PDF document text
    • https://blokhol.com/upload/files/fizekatirep.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/be5653e0dc7430108508b1fe8e784670/dogetixixojukeju.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/bofiradu.pdfIn PDF document text
    • http://idroter.org/userfiles/files/33194484507.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/zajemisifefoxigatez.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/17606386261.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3da9b426---zeguxikodugif.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/41347809109.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/97581115591.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/98594783216.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0bade8802a71abd00ef688416fa9a58c/witesobesi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5becc903---84695536554.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/91348711657.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///5117170648.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b444b75f---65235016787.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/ditiwapiz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5610d2c9a4194870ecc7de65435c3b1f/zeguguxasomexado.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/dexoserokisemopiben.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/82121957600.pdfIn PDF document text
    • http://regcureguide.com/files/files/vukuvifegagezovuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=solving+equations+and+inequalities+with+absolute+value+worksheetPDF 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_off0000b87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87B 15536 bytes
SHA-256: aeb4182943dbac3851b861539d8378741c5d7fb0f0e7d823699017c029c81be6
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 11232 bytes
SHA-256: 04f9cef78308c8384f5e72f60513c374aea5ba80d8fbd83b4109733e1338a3bc

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