Malicious PDF — malware analysis report

Static analysis result for SHA-256 994e4ada18e122ec…

MALICIOUS

PDF

72.1 KB Created: 2021-09-30 21:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a56403b2cd7260847520597762a6e323 SHA-1: 26e7661a2e799d59fff1a32de266cb06871934d2 SHA-256: 994e4ada18e122ecbfbe53b016e39b8a3fa7a1aa20f2ec3c9dc36ce2b4d21f2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://avs-market.ru/admin/ckfinder/userfiles/files/namufazovovufedab.pdf In PDF document text
    • http://faw-asia.com/image/upload/files/tuxetodo.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/dativesorarudinubovamuv.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/37172152451.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/filax.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/28581285628.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/moguvoxavovigibe.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kezoxaraporodusegajo.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/vanife.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/23045860795.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/60076067062.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/90396247397.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/dubuxa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aa4ec433e1cbf9e6f73a8327f51a075/rubatumuzililigoxezim.pdfIn PDF document text
    • http://kleiberit.ru/files/file/54606385971.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/77876097755.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/dipubetaged.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/63113934068.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/wolaj.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/83345677289.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/vopezogazototujodadure.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614caef1892a1---85391427464.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/sozog.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/cec3c65628efa492fd949031dc5d9a5a/11621824304.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/52633366789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mortal+kombat+mobile+hack+ios+2020PDF 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_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 10860 bytes
SHA-256: ba447f2de25a86acd8695852ec9ff7ddc3ae88a2f095e1dac3ee26a776b2bc0e
font_01_sfnt_off0000ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 17044 bytes
SHA-256: 0f04b4fbb2e95a026d61d5ca55681179036399ed4085500467f5ebe1e4a96801

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