Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5769fe8d4d11af7…

MALICIOUS

PDF

76.7 KB Created: 2021-08-25 03:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30b7bfe3a7a99952669eab89852702ad SHA-1: 8e99d3f7da87369b67435a93cd187be8c07f7360 SHA-256: f5769fe8d4d11af7888b106431f9c11cac78c22357f1f7b0561724b81d88d433
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting, indicative of a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://kingsauto-bar.com/js/upload/files/94544544400.pdf In PDF document text
    • https://ctapigroup3.com/contents//files/25069959772.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2ip6840pipfj4l5go6sfq6hich/93224805020.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/13665608122.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/80289500612.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xarobot.pdfIn PDF document text
    • https://bselink.com/userfiles/file/zifebeguduzesumowifudedo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2p6u1t462tp6vs76u5fcl7eido/xikaxawobaxutunagebuf.pdfIn PDF document text
    • https://efnnma.org/files/file/21472475415.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969c5dbd03f.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jofub.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/lewaxagiwexuxilezenuduleg.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f2e19105---sabofomi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/mirokexisizuduvenikiz.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/sifobexunenimog.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/13be86f1a3eefcf729f24fd472254d9c/xadolemowisik.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/27962754931.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/87621671658.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7b7c7fa80d4f059b3c82faab49c71f9b/51787493589.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/77396887504.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/68531800144.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xagaxovelumo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/lifopegibave.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/17636081511.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a5c1539e---29788226746.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076403eab951---gupisumejarixigimosidik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mbo+in+hrmPDF 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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 9900 bytes
SHA-256: 34dcde5fe0479dd9ff6f672cb8c62eadc64c9a93e876084f02bae8bdc15c1d76
font_02_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 15576 bytes
SHA-256: 1c053b33edacec48587bc4d67a963f6c12fef0fbc15189a0f0d65f590240473f