Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17889733d3dde8…

MALICIOUS

PDF

101.1 KB Created: 2021-06-28 05:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1eda978eef9e88ab86af50a3a43af5c1 SHA-1: ce319aae2371bab31419c598cf654759f4bae8f4 SHA-256: 6a17889733d3dde8cb3e002a626b6e3c59b9da1b88caa87c05ccd71eed1df32c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/32646784902.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5884e0c8---muxibevuvudumusorabeseto.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d4ac80cb---pivokuraropelivunubif.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/busalowuxabekisizaderupa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/24225001647.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ueu6vmk79olm7lnkja3otl34gk/1191633244.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/278b78ea5dc967fdc25214a5dd6daa4d/jexivizidegugirowex.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3ac3dc61---60970080682.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ee1e01dcb56442eec2e8de855138efd9/zepupewutenif.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085c436524ee---39847248417.pdfIn PDF document text
    • http://millecolori.it/images/file/vudenekuxovogilefudela.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/34280ddbb21363a06ce67ea996defca9/63159101548.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/12401691489.pdfIn PDF document text
    • https://majubesar.org/contents//files/6335790399.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vpnmp2nu22n9n8aqvnqe1q3ggk/40609569602.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0f9d2f91---57044307140.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843a705c771---4676810051.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/kideratenuwaxim.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6a20db2802e7237d518ec259c7c2814a/51337879832.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0ic57h6otsuq487npg2s0mpf5h/putabivololetuvulaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=artificial+gametes+from+stem+cellsPDF 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_off00012b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 10556 bytes
SHA-256: db2e788b02117387d18068e77cb38d427767fbaa7d9f90977f8cee3e3185c50b
font_01_sfnt_off000143ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBD 16780 bytes
SHA-256: 791ae248df7f63b02a0431b5a4f6f6d094e9cc2108f4d69ba7b28711c18a9bc1

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