Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9d32b774ed96c6…

MALICIOUS

PDF

100.5 KB Created: 2021-07-26 02:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0bc0800a558a966f8458cfe5d9140b0c SHA-1: 89491c5dcce3b800d1599977f874c1c46837c54f SHA-256: 7b9d32b774ed96c6db74cf4d176e324b9b3a559ffa6eb26cc183398b7477efaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, the file exhibits characteristics of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination and evade detection. The presence of numerous unknown URLs further supports this assessment.

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.
  • 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://shqinze.net/admin/upimg/file///56399193574.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/oqa14u3p26ppnvv3mhgipn6d7l/pupadutepem.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210617164621.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a292dad1599---13640629364.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/cadd0060a932f02f12e38d729206269e/21131457299.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c62f89a6c04bca403b092bc0ff1bb1ea/69071443911.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/54486680102.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/772970fcf22f9feada9062fb1008324a/13265503517.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff3fa97f9---pepameloxegula.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/kugexopidesixenekomi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609255cd015c4---94396673803.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/28080596371.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed908da0697---228315957.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/begabodafixoxapatewamof.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/zawefivogoteve.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/50b389e4becf01f3aaacb16b17d6b930/88909031733.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/kaluvexigotunuwulovav.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e564a2f3e0---disijeduwalowapunepabole.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c52e24ce7---13437538195.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c461427e12f---wemegup.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d54bd7f6---42468779576.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4d4277808856a6fdb93945901934b554/bosotekara.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/uivn5qfllmb07herjhpvmn5j55/miwumutokekiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=%D0%BA%D0%BB%D1%8E%D1%87%D0%B8+%D0%B0%D0%BA%D1%82%D0%B8%D0%B2%D0%B0%D1%86%D0%B8%D0%B8+windows+8.1+%D0%BF%D1%80%D0%BE%D1%84%D0%B5%D1%81%D1%81%D0%B8%D0%BE%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F+build+9600PDF 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_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 24104 bytes
SHA-256: 5f33a48fc42a4101ba7fa33939cebcf565822763e2fe0d744adabae89deabae4
font_02_sfnt_off000160fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FC 12968 bytes
SHA-256: 33579144c300136631366bcf45568dd94aedadc8e35d0e25c087cf8834139cae

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