Malicious PDF — malware analysis report

Static analysis result for SHA-256 4003e50e573e3e97…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 02:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 984b3fe1e863de75a34482c903130748 SHA-1: 61c5dd2340c910c5fd1b820745fee1a36c6791f7 SHA-256: 4003e50e573e3e978746e6f00cf59ff6f4f16f311c8f5f949badfbe808da9637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://crewmak.ru/uplcv?utm_term=good+will+hunting+full+movie+online+free+putlockers PDF link annotation
    • http://namlinhchivietnam.net/userfiles/image/file/51343474392.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/jelorebetix.pdfIn PDF document text
    • http://devison-matras.com/upload/file/41160784594.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/43089094650.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210909204539.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/41264906683.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/tamoxanovukejabi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2524b8725---93518084414.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6141F2E3ECA26.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/wuposofavalemajizo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/td22nlnngfli0ld0r5cpaojt58/zevopeve.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202198210416988.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/86443284176.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/35709472846.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nugamoberog.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/35435281945.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/6926817668.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210903134809_cnVmYWRlYmk=.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/3718717015.pdfIn PDF document text
    • https://12shio3.com/contents/files/9681999528.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/60894798729.pdfIn PDF document text
    • http://qzgj.cn/upload/file/33295019908.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/46626293756.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/89483888514.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd1782c96---zevudomudoxej.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/zorabarij.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109260636182104.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/88606503002.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_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 17704 bytes
SHA-256: bb0f0a7fe38cae9ca9da4ad5bd6d8719716e56b96067ea91ed378e241add1ec1
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 11288 bytes
SHA-256: 6f3074ae5f58b9f5aab137c78a11e5e3b8700e7862b1cc6646bb9a92f622cffa
font_02_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1