Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed1eebe2679e3c0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 00:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b8d3103d771208da93d8981ec65003b SHA-1: 57227b485bf1bef3704881d51c3f01b2da442c55 SHA-256: 5ed1eebe2679e3c0345415b97192dc87bf1910a7a9975fcb36e7cf8c58804aaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload directories and disposable hosting. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/256b658b50cec01c12e850e356373e8f/niterapugarurodus.pdf In PDF document text
    • http://vedepcuaem.com/luutru/files/59541130767.pdfIn PDF document text
    • https://nyig.com/files/file/20176793766.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sisamegosivomakowuvosuleb.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210907_170006.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/62909215149.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/62262073959.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/10890951788.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/jotikedoxap.pdfIn PDF document text
    • http://contextuae.com/resimler/files/zivazetu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c863768f4359d811cdea084347ed054/boturoduzixedite.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/96014025072.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf18f1dc1---70754109898.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/bukibewematilinekem.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/96634088612.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/14596769423.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613d199cdff2f---sesixapebari.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/19083529828.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/hs30amlcsikj76vn8rrjegun65/pixokaputovagubejimi.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/68082429661.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/79378798129.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/dusasew.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905183324.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308e914d450---memesomunikukavosexe.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/namofaragewokuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sports+live+cricket+matchPDF 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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 18868 bytes
SHA-256: 53776b4b6e4d35695fe65c64009f6c61482e6861538624da0912d9160bdd0f65
font_01_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 10768 bytes
SHA-256: 4b139ecf2512c2c40df26b40ea6a8530a3ac9874af91faea5c7cde70cc424a85
font_02_sfnt_off00013193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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