Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53495ed96ff5430…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 19:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03d77c384c241fe7656430b5289d1827 SHA-1: 72ca21252e81a7a9c21fa9a0136986e146b1d7da SHA-256: b53495ed96ff5430250c0e1d609fb83beffd4f73fc708ca00d93e38a1157c3f5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/000c8ca1ffb9f13503720976f3f116bb/91519963414.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf7cdeaf62---kokutozupevik.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e91cac79c6---rinonemiforuligufufosew.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bded0a1b2---776550192.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/fumes.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/87641204916.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vezevikudore.pdfIn PDF document text
    • http://ndt-ultratech.com/files/27489038945.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/50544171232.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/26440789275.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab182a12f---58641187467.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/78223083146.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/wozixogirozodapowoxedil.pdfIn PDF document text
    • http://minhanh.com/files/fovewuzunekulibejubuzisi.pdfIn PDF document text
    • https://starbox.fr/img/files/buvazogobig.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/mewumopenedoderutoda.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/zoxagubiforivubuxiwogi.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/62523824309.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/luzoweneso.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/84874881176.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/didokobumuripuvizafaziwe.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/figokoxu.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/10013341626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=math+riddles+for+adults+hardPDF 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_off0000c6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E1 10440 bytes
SHA-256: 556a6e8866e5509af7ab3c7b9080d9ba4681d37dc86a4f557122e1d6a0bf8b57
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 19448 bytes
SHA-256: 691e3b350290ef124a88b045ee96d94202e079d1a3f7db47bc477e7a3546233e
font_02_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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