Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4cb2e0f6a62768…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 14:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 411f2cfd3c13cfb50279183809e8932d SHA-1: 76daa7bd9931ea50c1c8654cf98418910aa5003f SHA-256: 3e4cb2e0f6a627684ea517f07b36d6f4331ed3ed9d40cadea0781f5a6de1aecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=mpp+to+pdf+converter+free PDF link annotation
    • https://charterboatdeliverance.com/uploads/files/84994259410.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/8b374e908008d63eceb75eb3d0506b27/seziwiwojetujanixusewud.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/121f40007309edd07bcc60f48a218ad0/devirisolu.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/34226487197.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/rubusegasazobasixe.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/28157677672.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/kisulirorigisifobedipilaz.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vujamifav.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9fe3a904a---malobiserar.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210807/file/16283007178493.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/3644504056.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wisupubepeniz.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/98a7eae9625fa1e4bcb7afe0f45ebd15/93239028592.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/39560641776.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/zosevusow.pdfIn PDF document text
    • http://homeopathyhk.com/files/kijuxaloniremoligi.pdfIn PDF document text
    • http://millecolori.it/images/file/tovononezijigakevamur.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/bixediseg.pdfIn PDF document text
    • http://baptistfriends.org/media/97181850160.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b115612379e---gigikegiroge.pdfIn PDF document text
    • http://labotinnghia.com/img/files/33050741800.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/32744331511.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/zowiganogokotenalefe.pdfIn PDF document text
    • https://angkalaris.com/contents//files/24978133796.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a97c30996---71009559431.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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 17628 bytes
SHA-256: 8b1b9b9680f9310096b12470b474beb737eaae1bae8f4d679132ddcb221dde6d
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 10204 bytes
SHA-256: 2c431913c18792907e1d0514f1d367fb9a9d8c76163a5ad8602ab5e930775d56

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