Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc76432ddb8e310…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 06:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 211182070dbf9b35c1cd7b3d97e7bde8 SHA-1: 20cc7704cfb3a51a981fec2cb8e7540c6ba375d0 SHA-256: 4fc76432ddb8e31082c8047a1d76a408a37ecfcbffb078f911f361aacb0ef3a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress uploads, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tomaszbizon.tomaszbizon.pl/web/uploads/files/tazelazipivofo.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57067af3aa---98848108886.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/27393480055.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/73c8fe6435564808a13cfc72fd1de443/6523919604.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/lidewupisumekerolipari.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2d63b053a703913cd96a97448c6de21c/61130688900.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b010854ffe---povimeguroxebawiwe.pdfIn PDF document text
    • https://bloc-immo.com/images/97203930281.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/fabozelekoso.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/18140804465.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/84262121760.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/317bc91f4fc18a31b85e8fdf58998ce2/vokadojudalisovoxujujon.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/pujigofatotuv.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/38003784008.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/94220053639.pdfIn PDF document text
    • http://sam-global.ch/files/file/45408641578.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eb5e153b34854f904f44cf8b52de936a/wobepetonataf.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/sisiwaxuvit.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108261342253463.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/3414869949.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/324612819.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jefetimarikonos.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9e2a01f49b8658682d329429fa1614fd/bonif.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827112024ea---47214645965.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/dosipebanizosivoreju.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088798d42372---47472126513.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/xujowisudipojuzugit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=arterial+puncture+for+blood+gas+analysis+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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 17368 bytes
SHA-256: 3eb50bfe7c199e7a800114080408813170034019654fea49fbafb03a5115c4e8
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 11132 bytes
SHA-256: f0fd6faa973063db25cdba9c448f15f4d1254c7ab24901a5c39e37a02d321fdd

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