Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcb16e549d7dfd5…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 22:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb63dba00221a0b6597acc21475654ae SHA-1: 98a712cf851b607994149275108f9ba7833a45d6 SHA-256: 0fcb16e549d7dfd5b42a17e4dc9d8cedd19f07ac651eeb53b662d9bf1205087b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which are likely used to host malicious content or redirect users to phishing pages. The presence of a link farm on disposable hosting further supports a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df310254a---88698386102.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5t6rdjcvok08artsa4kv7sot4p/weresasegofe.pdfIn PDF document text
    • http://mousike.it/img_ins/files/30915978918.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/ziwiberibedopojapolofunup.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edea57334c3---39217048755.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cimt0t0ccngpn1peniv0pr29od/nuxidela.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/defer.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/wabokumi.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbe561473e---96784616922.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5c8ah4rl1tgjup1vtjdhk6hhpd/10179428723.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/71s57j0q3mlilossnaimuspvap/delikidakolozawuv.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62783c573---98264530259.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/velepokeke.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/bijux.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/33766233524.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca49dc26cf8---93196096623.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lu76qupriu5sbcao6v0gavokl6/rodogiwodokoj.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/rewiziga.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/18500680473.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/458323c5ff332eea25911d78da72dd46/modaserab.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/12934052476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=places+to+go+in+mozambiquePDF 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_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 17952 bytes
SHA-256: 723740d3f1a00095d2cd0a734b6cbe1372a241a227dd9b38757df9dc71654c2d
font_02_sfnt_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 10920 bytes
SHA-256: 7bbd05babc90dd43105a059c98a00cd7681614a5205f7cec9f191a3c6422e630

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