Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f83952c1066d89a…

MALICIOUS

PDF

114.1 KB Created: 2021-07-27 06:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bef5b94b599b7a6f9af614d0ebcf8f99 SHA-1: 49feed9bcb7b29c938ae7050b12ede12c35f5592 SHA-256: 5f83952c1066d89a2aa9a71b5b6819949ff7668c594ae246c329f0f2daedb332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS uploads suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://boathousebrokerage.com/userfiles/file/kawabupewuj.pdf In PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/o5e2vg5udchdc1l82j5rupl951/wazilewadozimoruko.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8f7433f8---81761243291.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d274ea1e3a2a51fed98a3daeb77b4dbe/nimoxojetupoloxaxige.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/losebak.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/87943d61a1ab52fb27cadab5e13cc4b8/sodesotupiwenixufodifuz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073aca27f231---82666868748.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf5da17072---gulofu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pv7p7q8q21llcccuka4qbujtt6/31857365645.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078381ddaf93---24170674364.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/62089869301.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/19452893269.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/tebaboxazipatu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674e326b3e---samagofumokow.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7b41c58c699caf13615b919aa5cae579/situkefijalo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a781466d8---falibixixuwakevuwiv.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/jokusurexowawu.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/nitexonobim.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/nelalatuvivavamujule.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/29098962219.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e860bf529b0---dinatom.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092b36a7a339---88309356379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anthony+de+mello+the+way+to+love+deutschPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A58 10792 bytes
SHA-256: db5ed80db0ae7daaf88b27925b3bcf412bea5b40ca151a95471be63dcfdda659
font_01_sfnt_off00015329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15329 19960 bytes
SHA-256: b3861ddc6a83c03590073171669784582da739a8cc9df4afe382275e602d85db
font_02_sfnt_off000184a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184A8 8252 bytes
SHA-256: a535d41e0c9dab41b1b0026e7be70aa1c1b35a8623b6e46a90c53a3043f3a2d6
font_03_sfnt_off0001a087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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