Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d2a5b79408ddb4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 00:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78e193b76bb8036b36949657c76858ae SHA-1: 2b5ac1a2c3b70c06f54a23359dfdd7c8e3d154c9 SHA-256: b7d2a5b79408ddb488c09d05ed9ccd3d5c4b9c6b97a3171505e42f84a0a86fcb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm on disposable hosting, combined with the presence of external URIs, supports the conclusion that it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=concept+of+social+psychology+pdf PDF link annotation
    • https://zoomkish.com/basefile/zoomkishcom/files/zudividizogam.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zovalalidebuzeposid.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863c4ab6221---18005581329.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/bipelimis.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/5660496909.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/komidugobifovadozofumor.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26719e103e---tajasififeku.pdfIn PDF document text
    • http://fygl.net/uploads/file/180617401253.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc82356822---28434127057.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/48360215333.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c01491928a9---1369936394.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/fugixudadal.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/69074184117.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/54412739182.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/xevazikakomez.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/defuzujanonibux.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/84320557660.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3a7981da8f138ed639a4b9c8a843c119/32969090764.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/5513400940.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tvq30ks9lkfh96k2c5aji9l3g4/10937371061.pdfIn PDF document text
    • http://normel.org/files/upload/file/gekujonidudabepuz.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/79769558642.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076342f18bc1---95716515272.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098583fc123d---rofixidumoneme.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/fabaxamora.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2fb4ee90b1ad083e690d01e11b83037f/49181712901.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_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 17056 bytes
SHA-256: a1d7a8d1d1f589dad11d7fbb4dbd3fd6e40dc00fe6470a81518a0512dc10781f
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 10944 bytes
SHA-256: ec1b7da0518bff95658bbb10d1c50cad5abe630a7f4ff4fbb32b11b869c934c2