Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cb6a313d19ff58…

MALICIOUS

PDF

75.2 KB Created: 2021-09-28 10:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81effbb096d3cdeb498426ba8117c09f SHA-1: dc869ac58bc8785402abd639c18b6bfb8877aa05 SHA-256: a3cb6a313d19ff58aa07c948c742a4c9f2a5938f6e58f8d4ae688450550bf5df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://infrive.ru/uplcv?utm_term=full+hanuman+chalisa+in+bengali+pdf PDF link annotation
    • http://urgentcarepb.net/userfiles/file/43050894097.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/1548023819.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/92100468602.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/zituxaz.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/lovum.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161396f704d8ef---fizodurukapasijusuk.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/55501236488.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161440a5feebc8---zisoloteromurepulefudowif.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/1253396467.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/31080641135.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/16555763708.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/14600798351.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/5026215854.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/jezefejapunenetewi.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/99214797192.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/defuw.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/6878184488.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/romokatutu.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/20047544800.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e76651a5facbff44910cb17a709f87ad/minabudurirusajawapovoz.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/98094590865.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b636424726---wotag.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc53f37b---juropatumewawer.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_off0000b785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 10968 bytes
SHA-256: 821c81cc0f389b4f63566219940fa094ac09bc4a189b3f69e44f011946f1fbc8
font_02_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 21188 bytes
SHA-256: 09b14b12f30a807f4a0d903a21d92a0f7c55f3703a1394b44348b44fd0d2c8e7

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