Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c6ff9d4483a1cc…

MALICIOUS

PDF

89.0 KB Created: 2021-09-03 00:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac62ff6e34d68904d9d556ab0e2c4f26 SHA-1: 8c2a5e04f95c0df3d90ad1288c791e1cc165fc31 SHA-256: 57c6ff9d4483a1ccf030b05afa27c4b9342709389418c46fdde73e45ab7b8da8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised websites, specifically leveraging WordPress upload vulnerabilities, which are likely used to host and distribute further malicious content. The presence of these links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef70ae5a8---3899274957.pdf In PDF document text
    • https://ancoraeducacion.com/images/18699514520.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160791e88709ef---24116107839.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/zejuwobopugozeburokiz.pdfIn PDF document text
    • http://strandedtattoo.net/file/girasogiwexidajom.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612347436ea1e---92683138838.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8a21a7b9720b4254882971946c64e048/29722665800.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb439806c1a---11277699947.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cpu4ad8c694hlnqp8kfpndh69n/48834005668.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gngvncm8095fulef5gpccj0odc/90244556333.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507030728800364.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094765cc540b---nifuguwikexefipojorum.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083369a413d4---ratelidogifesofifibomi.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/28493245563.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/luguwibozewilewazoxabo.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/97566013329.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/39654976826.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc1cd4317---jewigofufuxewomizeraf.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/lokosadowuxobive.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f1110c1d---rasusalokozibudamafex.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d8626f37---40870293357.pdfIn PDF document text
    • http://teplospectr.ru/images/files/vozolopelibilefatajad.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/75267774155.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/38071cae55eadf0e239f48d2974b842d/mevefoxaneve.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3fa7f0a4dd5136457d6c7c7d44f1709f/jujebemudobitapanekusu.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210620023027_1065295744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=significance+of+the+study+meaning+pdfPDF 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_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 18640 bytes
SHA-256: 126fd95b67f68d3b35825f7b3e5ead32ac2d21d27eb00ba64d9ca2e9ff883838
font_02_sfnt_off00013be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE2 11208 bytes
SHA-256: f43a0b31f1580c0c4675704413ad90dc3bbffaf6d9253b65daa4638febe911db

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