Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77dcd99231a48dd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 04:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f018bd51c206780d29b39bf8017b4897 SHA-1: ed876fbd6849be69c339d823bc1452474679e294 SHA-256: e77dcd99231a48ddaeedbb83506a7f0193e9f0f8f23a4339de895ab4a466e315
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smshealthcareservices.com/ckfinder/userfiles/files/1087580797.pdf In PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/suxusapedep.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/tupibo.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/lukavuseniv.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/fazamafofobexoxizafimosuz.pdfIn PDF document text
    • https://laser123.com/geektic/files/8089213899.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f650c2e51---lopiboxok.pdfIn PDF document text
    • http://metallpress.ru/files/94135495916.pdfIn PDF document text
    • http://upakuika.com/img/file/20814401876.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/71163678285.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/sovewovatunefol.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/94701827227.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/fawazujiwujit.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613485481b553---dajojik.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/65996227448.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xujetawanajupezezer.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lidam.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4j6cfcvkmrrokc7u57elvog6v6/81513314048.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/39411407929.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/kozasizediwupapu.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1671761419.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/67517770049.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/9654084415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=draft+day+putlockerPDF 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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 21136 bytes
SHA-256: 6f0b617303f3993f83a795ee7431daa477d45885faabfae85e7534eaaa6bc31f
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10556 bytes
SHA-256: 745a6ef3dd79151d9c39339b3dd10f26472414c57ffeb7d851a58d554de8620c
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1