Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f3129cdb94b6c4…

MALICIOUS

PDF

87.6 KB Created: 2021-06-11 20:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bcea011c8e97cd5da128bf5640c6e457 SHA-1: f62d376dedc6f8e583a89cd3639fbddb5f85f580 SHA-256: 02f3129cdb94b6c420d5a5b951e6acb3b1cda45ca63440a911064aee197a5784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links pointing to compromised websites, indicating it functions as a link farm. The presence of 'utm_term' parameters suggests an attempt to track user clicks, common in phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=bdo+farm+spot PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160910a2b9787d---54314076643.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee137a5a71---tedoravutiladawik.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/oe0gkq16u6tmrg4vhn1cplsbj0/75579940669.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8a755e380727be3a0f526d0c410d5f15/68520981263.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/36587231146.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/89671968471.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/detanelivam.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088fea7c16f9---35030704309.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/i7r0q0s3gnjckepgdb43qhd8ff/talagubivuba.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/91465198293.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a8e709f8---sazaregedopuza.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vujopun.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/55c174bb8623e31c87b0bebbf80bbbb2/pasedokivuwuxobalu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9cc81864---14032547447.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afa81b03374---8873169526.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609485ba65613---sajesadap.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c4ce9e470a8b0dfc02113fece8184af9/gotojakawilabigezon.pdfIn PDF document text
    • http://usmleworkout.com/files/file/mirebolo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722eff9dd10---72261484354.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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/xaIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 4720 bytes
SHA-256: 12f1b12bc2c5dcf1cd39859be5b049af01039d1f6de335a7b8b794b0a575e890
font_01_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 11304 bytes
SHA-256: 00298ac31797e7bb20d836387f41a00a9530c92e009d64e224f8dcca0206ad0f
font_02_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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