Malicious PDF — malware analysis report

Static analysis result for SHA-256 f558faf51c33feb7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 15:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f432597c2a528da0c82620b6cda189f4 SHA-1: c5df232ef93afa2caf39b59fb4080a7bb9b6110a SHA-256: f558faf51c33feb7be2c98e2081ac0ecd0ab6283ebcb19f7190bc8111268dbb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many hosted on compromised CMS uploads and disposable domains, indicates a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being delivered.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://garglob.ru/uplcv?utm_term=income+tax+challan+itns+280+pdf PDF link annotation
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/5524817621.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qnn4t8h5i2tt591fikimrm3hu7/ninimodo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2e65afda---sepujapepevopexesurapuke.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a862c33d779---73139490875.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/12627831062.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84ae4f1b4---65032561245.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/bexovidod.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc09021eeaf---97689836532.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/peniwur.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zigewejagotobidukeboku.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/49792315678.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210822075022.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/42455163264.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zuzolodete.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/gezonev.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668eee1ba8---3979465542.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ffn74mcv4sa7ua3853ckm5tnad/98222411305.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/sebonisazigotuzudas.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2c07ae370b847c1bd25738101d8a6159/vufasibusowusinivolo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7250ef84---26754225833.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ab9354b2---52766117724.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/96369851935.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/11902343136.pdfIn PDF document text
    • 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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 11288 bytes
SHA-256: 39422f7d813b586f86aa4f2aa01b3fe09b7c665f99ea2a183f1a87c1a5534b04
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 17200 bytes
SHA-256: eb2e93fefc9e73b3e931f531af63c7dac812ce382173156ddd8395ebdbc1a0e5
font_02_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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