Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ec90a3824e2b20…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 04:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e276c57f79f661215c122e3e8801364 SHA-1: f58310d0af82aa646151766e88135ec25036d607 SHA-256: 84ec90a3824e2b206469f1b48aec54baa3be8342a0838c53131fae0723ba45cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=permeability+in+vitro+in+situ+and+in+vivo+methods+pdf PDF link annotation
    • https://flyags.com/editorResources/file///90151017600.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hcva81353rt434ejnj9gmot10b/kikinexavebofukorumakej.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tugitozugerujawik.pdfIn PDF document text
    • http://spakimthi.com/upload/files/japiw.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/nedusezagakilajodovu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38950419487.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c17267ea7b7---dufinifewobev.pdfIn PDF document text
    • http://willbramephotography.com/99252421190.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/42905204755.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b38383d01bed6bafbfec15adb420b17a/54609102013.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/68582377336.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/turejufekonatavexi.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/1253784314.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba94cd1a2ea---wojozip.pdfIn PDF document text
    • http://zzquansu.cn/d/files/laxadazezigabokijup.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kuwutewami.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/85526490399.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119065b7bb7a---49441292639.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/24840158621.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/rabenorameresiwaserug.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/36830154954.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/xutosogupewujuzalosa.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/38474624325.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/vizadikibikaxawib.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/3214643598.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_off0000cb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8A 11184 bytes
SHA-256: c005cbdf88060c71b8e7aaef68aeff6730b3f94915fbf86aeec756cdb4a325c4
font_01_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 17304 bytes
SHA-256: f1d002e40c32daffa288bb305e549d93ed6799725698b8b1b9c1e81d30c59808
font_02_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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