Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4bc8c6ea0ef208…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 01:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b31adef5087838bb8fffbd617312d0ea SHA-1: 75d817f8fdd875b93036b2c82d318a9922e4c514 SHA-256: 5e4bc8c6ea0ef2088ca3722f68968240f9e16d546289d1398e9e027eeed15ae2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=how+to+move+icons+on+android+phone PDF link annotation
    • http://cuuhoatudong.com/upload/files/8917939050.pdfIn PDF document text
    • http://amdind.com/userfiles/file/94668740910.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/janawanupixosumigivewo.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/xujovazepopox.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d52d38508---taxatupi.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/30152181859.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/47070523430.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/44977998694.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2cd8879b44ad1854eaf9dec5652001bf/89390837005.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xotikaxapumifemarariwov.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/zinidamosonosonokeveluso.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62b3c1b87---77068482312.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_202949.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74787674383.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/wutasapazunudotudol.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/vetexagukafoba.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/92545256400.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/26364e6f22cabb981aee6bd0d3e417de/pulumagopixinowevaxomilo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6cc288de7---77967753352.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/96486117574.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/pozinumejevoxakodigo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sikuwiwu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0e1a0f1690583bdcdcb0a4c8b9192a33/gonelamipepopimumawemul.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f52407da0---jugaxejojogebukusufidokal.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/kuselevemik.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412c4f7c7e2---nopopati.pdfIn PDF document text
    • 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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 17812 bytes
SHA-256: 3246d627c6830f3ac0a7478823cd8c0158e0caa995ba78053bfb4a3d3677a350
font_01_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 10876 bytes
SHA-256: 59676cc53c900ca494dbf92b92e1b436db681fa4364d3c3dbd6964435434b9c9
font_02_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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