Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef680695aaf08964…

MALICIOUS

PDF

599.1 KB Created: 2021-05-06 21:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dbae13f246a2c07ec1fee81a5dd4074c SHA-1: 68b7364ee9e1810fe771ebf14643a054d0683a8c SHA-256: ef680695aaf0896458fbd3d43d75b1204a37e8a50b0a0acb8f9a5b999def5096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document, disguised as sheet music, contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links, many hosted on compromised CMS uploads, points towards a delivery mechanism for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7391

Heuristics 5

  • 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.
  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4c727276---minosizadeko.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f94cb41e5a986aef67ec54d00d542487/1841485207.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe9f611e1---16628959939.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/54558108a441293ea10943a4601e9774/jinefi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160775de744691---lotunafaxu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/17464c00e67e43348225d278686f9cd1/36630141105.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b6af374b5e788966e98ab80c28e7a426/63538008435.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34e2b46cd---pefami.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3da20576facbf9e60385af592ebd527c/79671350643.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/455399e130539e81713a8b4283d62adc/95803387307.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/c59f5ag22bi8p2aslj82kov48b/jedupatedes.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607821783eaba---71344621456.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608216fd4ed31---mikeluxutupi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7373318b1---vizenuvepoj.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b520aa97---finuwojew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc761cb059---89017886752.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8541ac38---5980863462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wolverine+blues+jelly+roll+morton+sheet+musicPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0008cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD28 3376 bytes
SHA-256: 3d5f326e826fd2214c76f483a6705f7d5b67034a8a60940e37a02c7b64a9863d
font_01_sfnt_off0008d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D956 5100 bytes
SHA-256: 44fd22d1af22aaee950aab6c8fc75c8d72ea4165937b5ec71a5ea27db8e97004
font_02_sfnt_off0008ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA95 2488 bytes
SHA-256: e6c9bfdd0612b8ac4530c2ae1db47e522c64d9546a778db47254f0711c3270af
font_03_sfnt_off0008f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F561 17284 bytes
SHA-256: 3ddf1a2b6c1c3085e294e4a26172d05304c414beccdb6329dde2fbc8ce23bb8b
font_04_sfnt_off00092723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92723 16124 bytes
SHA-256: 41d2e213e1a8e6634d2331778003f288d63e84852d1212ef0c6c8aa5ac40c01f
font_05_sfnt_off00093c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93C1D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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