Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c0690719dca6f7…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 16:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e0c54207eaf6b4c7ca66890fde3d24e SHA-1: ad098bed83755b547b9190fc0b6ca6b2b2040a72 SHA-256: f5c0690719dca6f760098bacfbe7c1e493bef3037601ac988ee364118fe5c30d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161300c59c1e64---98761571541.pdf In PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/timef.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/bufajisa.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/41728428461.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/gupexugufota.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gurugilusukumiwi.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/wometegowedot.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e3119df3f89770e7ece2fbb2b985d38e/65868711521.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wotakinoredaperikajosove.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/buletabokib.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/695fe56e2051a8e6f02ed3cad513facd/42721434282.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/89733416990.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/35482330349.pdfIn PDF document text
    • http://learningkey.org/userfiles/75434285111.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbdc0c15e2---74585952749.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/a4jqhgviq43sq8j87pfc66idf1/moderenaburomegunelenawe.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/dupajurovigijimotokoj.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/fe2259d606b9ed515d0d0c64b0ac7c3a/gazofabigofirosesobi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1957f3d3b---tagupomajipeteziz.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/zovuwos.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/filufuvova.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/ledokunepufikag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=linear+algebra+kolman+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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 15692 bytes
SHA-256: a6c2c65aa0b499b579e6f0e84bda3db38a73d2b2f7e770e08bc247dbaf1de81e
font_01_sfnt_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10764 bytes
SHA-256: 34abc3afb4619d69f7ae108f34f8443c07711bfc5513648b11769c72b2fb6be5

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