Malicious PDF — malware analysis report

Static analysis result for SHA-256 39caee537895f2a6…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 10:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed038636ae727dfcfa917558ccb0cc49 SHA-1: fd3c2c6a66807fe413e59bc55066c712c509eea2 SHA-256: 39caee537895f2a61bc9b4dccd276b5a5d5aeda346cf1c56395a40d96bbcc2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=cisco+glc-sx-mmd+pdf', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=cisco+glc-sx-mmd+pdf PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da91ca0399e---75956382353.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea16b761b---91010114300.pdfIn PDF document text
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/gelumubokugageza.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c562736b9b7d540aa582c8b31821c0d4/74718656176.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pijagogebikajewizu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103ada3b88b7---lalofidelesefajamineroxet.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/29233200081.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607283ea09ddc---xenojimuzelusoxe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9be771e2c1383e4a274d7de9167f99c6/gorofazuduzofutav.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867c1bc61f6---felazudujenisepo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/15500983259.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sijimiwizatejobuwavirugun.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/87120731726.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4v273cso4cd7nraco4untd9ch4/44435424557.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vumugugepiwegegi.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/95912496624.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f787a49a18a---durunexaf.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/xuwiletajugogirit.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/71196579281.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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10532 bytes
SHA-256: 93bafe3c5a82860a60cf2579375478831d74d168fee6fc0bb22011972f8eb8c1
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 18636 bytes
SHA-256: 5b968493775c0258b8e80dbb1b7ac200cb5665b01034d58e33900e52d4a8ffce

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