Malicious PDF — malware analysis report

Static analysis result for SHA-256 3684f99a92ff6b42…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 11:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd3d49cf5f4f4aa189e045371be0f4d5 SHA-1: b876199267833ec31973c43f5c0d3fcf70df9e0a SHA-256: 3684f99a92ff6b420b9cf4cbdc3a7344ab536f5e4d12db52b4c858c30da81e50
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The primary purpose appears to be directing users to external, potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0ku45aj7v4pl8jm10l1sf41dr0/30066284444.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/48688065592.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05f9aaf1b---veximamiluvapevamevosiwa.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/zivasojijetofaped.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/903121751.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255cb18dc78---vavupunaxonejunisevel.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///sasekufizazatinuxirugo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/balilad.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7e9e863f14a537e94c313b5dce2623d9/vebidosi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6116f37133aee515480b476e5a5ea676/rakofimilojefavimujisa.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/8949351518.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/t14p0dg540ueu4cdbk8ckoksvd/gowavitupos.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/35394026791.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/dixazuvusuxu.pdfIn PDF document text
    • http://kes.org/upload/editor/files/zaxurewo.pdfIn PDF document text
    • http://falerisztika.hu/tmp/4693459142.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/vapefawugatuwo.pdfIn PDF document text
    • http://land89.com/ckupload/files/ginawabilisi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4041b81270---78915233811.pdfIn PDF document text
    • http://gyobel.it/public/file/sogibejinixafaka.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/78340116746.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4865fa1788afca0640e92278664c7d9f/62855735157.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/gevexudazizaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=corner+bookmark+template+pdfPDF 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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 20724 bytes
SHA-256: 9d368b5e866834649fa29ac4e8018a09adb975962ada80ce0e1bb4842bea6de4
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10664 bytes
SHA-256: 28097f94e800b2796caa430cd23fac9554d242342426bbc6964be4e12eef4a1f
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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