Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d740f8641915ac…

MALICIOUS

PDF

83.2 KB Created: 2021-11-02 02:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 522716ed0c26a9abe19fe6dcb181c6a0 SHA-1: 27fcecf86d7ef296978ca5222d0644aa7b5f803d SHA-256: 48d740f8641915ac269df9cfd3251baf534c56f34690143b0f435723ddfd5dac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thuanxuongmonmb.com/admin/webroot/upload/image/files/97394915855.pdf In PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/7235799410.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hht4uot6l7kdtg6crk1udq9v27/62292871423.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/feloxidusu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/76fe5843f8d889a76b301215cf2a9d39/27231964937.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/peduxoni.pdfIn PDF document text
    • http://slsnn.ru/content/files/2915907381.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/dexoga.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/50623488370.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/wodujo.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xutajesavodetomobewalezo.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/75658236054.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/dukuzeza.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/zumexer.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167e7e891d2e---mijopoxodelimukebom.pdfIn PDF document text
    • http://proxima-design.cz/files/file/solenugarinujozovixadi.pdfIn PDF document text
    • http://namngonviet.com/user-/files/ratupopilepidadutasi.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/fezakemoxonokanike.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/67010006045.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/iq2nedjlvu36c7qhsru614t220/ginugibabekositalu.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/xuzebaloked.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/kemotaziturezasisodu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=how+to+use+water+transfer+decalsPDF 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 18396 bytes
SHA-256: 0f9e371ca1938a853d77861069d5f978f3531938457850be239cb8a4eaa7e7f0
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 10556 bytes
SHA-256: 39520cbf4670a0613da905eaaa676b5c1a8916fac61cc1a4f41cfcbe0ba23d64

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