Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba81b9cfb2086406…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 05:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f14be6a2c90dbdfe3643b6c9b232c268 SHA-1: 0f97e7b2de81426e2030c9a9ab508ccb79a14d8d SHA-256: ba81b9cfb2086406f02e0f44e4ebdf9b00bcbc74ed9596f2d13931ff5e1b781c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d883b5865---54573267864.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3a5ngj4m28cebejm6e9j897cqi/18946323952.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b1211bba2bb---jisuvunazibotojizoromaf.pdf
    • http://dd-eng.com/files/files/fedupeboso.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8922a4c255a868ace70331d7403d3e94/bubabek.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079883d3a211---44138051480.pdf
    • http://phuocthuan.vn/images/pic/file/96837125702.pdf
    • http://busanpc1.com/upload/fckeditor/file/3528289163.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/95e933d38641889b3f20d6b326f61358/wunuwipobanilason.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1ff44ec7---46434765723.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e74a5661---mixupu.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c401986108b8deefd1138be811cb4a74/rawakisobeka.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/31841684785.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873ab9b3848---30652256960.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a769cb6c---xuteset.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c7bce93f---midepixunewowez.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cd1cc7376c312b4e6684c68f4e460475/vatedojobe.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda2a42ee4---81561865512.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f29fd1a96---balatisowefemegoku.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/01a12bab1910b85cfff74fd460a028ed/fugunudagabizir.pdf
    • http://accessiblevehicleservices.com/userfiles/file/3299224428.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455571b960---15790081508.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a0f3f71f---88957181138.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/jafesumisaxifusonav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=metro+state+tuition
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 16792 bytes
font_01_sfnt_off000102a0.bin
ce79791d65d23a15e5344a59a8a67055b8c487abc9d525d9302963631fd4eedd
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 16660 bytes
font_02_sfnt_off00012e52.bin
43f0a7ee3b5195b73885d60717e96294888fbe651ecf4d1890111c24ba5fad40
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 10148 bytes