Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9eb4e5991ecfe6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 06:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efa20400d334aaea518ab079c0eaa3f2 SHA-1: b21ae1bda4d2a6639796fe61739052a408c3ca2b SHA-256: 1f9eb4e5991ecfe6d1ea58d97c63dbe8ffbf777c977696bea8541f0e0f8d881f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised CMS platforms, directing users to potentially malicious PDF files. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072002e92ce8---bidemesoguwoseduzo.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/545799b668424adada13c6458aca9d5b/92826462503.pdfIn PDF document text
    • http://hodori247.com/uploads/files/60199577235.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/n6l5h2icmcvutdlis6m5fo3fv3/riberemamesozazomokuju.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/26d263884be4d245815d985d8a7aef0a/bujigemazofewifivoz.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/fitewedajofejawujozojop.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/nosibi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f853165a73ada491855fdff66e4c6510/waronuwira.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aefb288687a5c2258683e97ddc56da6e/ziwovi.pdfIn PDF document text
    • http://ipublicity.cz/data/file/zaxigamezaleligo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/pgjts0k4clsqg72e01vhd4jeo3/25977743401.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8484397fa---kivitebigap.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021812344123890.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/55944682792.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ij3oip4fabftjn3do74t7jvob1/tonivi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c82c4ff4a---kexazevixomuvivarufarulup.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c9a13c15f---80732607622.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/rafolitav.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vumonixiporu.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/juzonab.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/14500786115.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/bifidiwawilidazedo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160833b6750b60---15059385919.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dilozazowegagigexo.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/vawenanofixam.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u2uk0677aij8b2756pnmjccce6/14593173172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+learning+station+the+bear+huntPDF 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_off0000c79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79A 16968 bytes
SHA-256: 56365618965c90d11bd3463fd3be7d9b86e68f81ebcabb4c60f3f5e3c8d311f2
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 10592 bytes
SHA-256: dd8daca4a4067272c223a8b869e12ccc5c483aa0f2719b1536daaac7f55ac241
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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