Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b46dc06f6caa761…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 10:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee7e473d94bbddf020c7471deecabd2a SHA-1: a028ddeb7f5c76e59925913795913f73aa6052cd SHA-256: 0b46dc06f6caa761102e6196b1546c852a0c070bccb02604feac95b822b0efd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress upload directories, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it is designed to redirect users to these external sites, likely to deliver further malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=properties+of+acid+and+base+class+10+practical PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d088b9d3---zudejewuwukimuz.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5f4b2d3cc---23626065919.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nipojokugo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611504fd3c83a---66013691306.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jadajenotaxugope.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/letiba.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b647354cf73---tigutefisopopofa.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/76942758615.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/marajiziv.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/deledegazinabuko.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/217998c28efb5195ca6c7b2acb2837d9/kufisovujofopoxosolepu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a054e5c8441---79710537330.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/rivolidexedomebodolax.pdfIn PDF document text
    • https://siroyensao.com/upload/files/51491327197.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/kkc97h3eoc2t4csi1qg9pjnv43/jegosizu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dvtcvjtrsev8nv2kle2pbinmvn/23015053570.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/sijogikit.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/texig.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gugek.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16fd683f8---nubalomifegozegalun.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/545899ed122a0e155d64e797054bf9b6/67930256333.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991675176c---75431442368.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6288d4c3c1cbe847ac4b43b562e57a6a/nokag.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e5b1cc5c6d80b5d266ae5aad7ddd81cc/kemejufegesesosijefituto.pdfIn PDF document text
    • https://lapdonline.org/file/norogabeb.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_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 10928 bytes
SHA-256: 180934eaf2d6e2ec3b97a2de3fbe45a9c4a671c51975e812c48e441ce96746d4
font_02_sfnt_off00013548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 17896 bytes
SHA-256: f91689da87a842ff0a1e4a5aaac107bf3707d98713f0d7bbe43e66b6f1202784

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