Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5c8aa35e061e6f…

MALICIOUS

PDF

93.1 KB Created: 2021-09-02 18:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5a0943a960984fbd04dc4fdaf0fc23b SHA-1: 9868468a7d3667cba6454f8aab9baae2e4290638 SHA-256: 5f5c8aa35e061e6f420042e5e67e8034975f8ddadefbfc2b76def2ead0f888bb
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several URLs point to compromised WordPress sites, indicating a potential distribution or phishing vector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e8d7732f---lerixupitezamapu.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0efa7d10166a5ad0491dbf0f92d27fed/vevosodoronute.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/jokovatizoguwaw.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/52316862377.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e209a5e439e---77364582836.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/u3fj3hqorqbsotvuqa66jju05a/piresofu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/3vj3has9h2ccepv4bdisamm1rd/turezasibafusemukikolalu.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/sonafefarasejojikejufe.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/50923696025.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/resazuterazopevuw.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/koposijinorax.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/71862527480.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc214d8510---dagekuzotagowujorejom.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/4a1f60f30a2f41e5154c057c2c9bd439/mebinalurukebelesixabe.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786ce8bf5dd---vofumijiviwuku.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae5b3adcc---xurabovelokugimoro.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/58607256437.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c88f38624---zimelukugukejijatiwidugu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/tawurelevelurotej.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ddefaa8c1c6266687f744f0a140ee961/29844273972.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/9055580886.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/5677564456.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7efec1c24f8e9b87d20f49eefc6463e0/93130417427.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/19504456463.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/61622653234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=yoga+vasistha+in+telugu+pdf+free+downloadPDF 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_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 11012 bytes
SHA-256: 73aa087fa485cdbec6f745fb1b02ef292d0d692cf58d3eb7c1d8a940c5e60cf0
font_01_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 20460 bytes
SHA-256: 1bcadf108a6aa56b89e6088d6cb6843a6bfb57c6b07dce608ffc961f0bd78cbc
font_02_sfnt_off00014e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1