Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5484264c1de0da…

MALICIOUS

PDF

76.1 KB Created: 2021-10-17 01:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07a77d26885a6acd8508e466e2b9dfc3 SHA-1: c6b41e2b63e66cdd51dd95ebf1f65f8825aec060 SHA-256: 7e5484264c1de0da572dd7913ae263a85d524f13f23332c9c04dc649c3e60d87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://jplus-ag.com/upload/files/BodyFile__61501F6E92353.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/tarasanizuxuxasob.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/mujofelesoveribomewifewe.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/midegufibajeb.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/43073621427.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/96501339788.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/40iooku9km0bv3c768m628k8ff/nevidekisuwovibavox.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/32753549236.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/93783704904.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/36851852164.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/72424792343.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/movabupafakezo.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/kibix.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/nunurewikuparomatuj.pdfIn PDF document text
    • http://tfforming.ru/d/files/nupewaki.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/22282198873.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/89081686309.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/57890752504.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1cd7797c643d15db8e760215ac05f1dd/namozu.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/75027150128.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/514ede04236f76034dc15a609a6fcb3c/49069037597.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/nozuboxatafovokumaxejo.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/88832910942.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/42100256615.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/wimujolosuzisavif.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=what+is+a+corpus+in+text+miningPDF 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_off0000c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 16936 bytes
SHA-256: af091efbbfb55adc61dbccd6e8aa6619a448ef70a2c2902d46af10f2663b5fa4
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 10972 bytes
SHA-256: 5b5d8a176d0c0af96d7956431b6050d7d3d593305944a26d72fa7b01df65ffb8