Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd422bd605236cb…

MALICIOUS

PDF

87.3 KB Created: 2021-07-19 00:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f368844b69236eb86c555b9ec0cab8a SHA-1: fa59fe1af7276df7a63572996c8f0e3496aec668 SHA-256: cdd422bd605236cbb2e4d35fc3eb311a9be98b66f04b66b64a9ceae3a04ebd14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/feb7f279accbb3ce55c009ac02e13fc2/jufexevevowoja.pdf In PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/pijus.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f5eac061e55f63b36d038e9d60122af6/68104058222.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/gu6p2m1513s2s8l4u5v5svick2/suxoba.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd95971d60---famokopevasawefov.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bedef3fb045ec83be949f3656babfd6a/puxegiwokaviso.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/zuloronezozujajewafeba.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a9e78a6b1fd51674ec32c055c3bc9bd2/31886451166.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d543f2f1945---vabirerefifar.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/65424103550.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061220330470554.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c388f3de22c---basefodubotifoda.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7516071ad5---jojipowuxosirimaxuvojijud.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/62831116883.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b027adcb11038d0f1aceab518e5caa97/97621562543.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/87914921711.pdfIn PDF document text
    • https://tepihtrava.rs//files/ligafovu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/nibenavuji.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/8565949268.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/75077969798.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/30465631998.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/807fec5ea1618102cfbfa9c927babcee/57406731511.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826785865a5---36513814809.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/boxefitununepirafipulida.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/610ea941e4627bb69d49f1c15b3dbb55/vamijobapuposamawip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=guidelines+after+vaccinePDF 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_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10556 bytes
SHA-256: 8318e029653fce06af97d3eb76c7b423a9f1559ab73e02e0547e65df1470937a
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 17184 bytes
SHA-256: 7b157f0a2cdb9b915947bcc90381cd74deea635eb9de3d05c45c73acdc7eeef4
font_02_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1