Malicious PDF — malware analysis report

Static analysis result for SHA-256 911e43eba4d0539b…

MALICIOUS

PDF

78.5 KB Created: 2021-08-11 12:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71593b7433df51b5c789c914fd304652 SHA-1: 59703060a154b39466b9f4c88e968f16d3e9c2d7 SHA-256: 911e43eba4d0539b51ee69df28a1c9bff21fc6564cec968f0c369e79252a8960
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0dc2c63fce4d2d5b6b22ff8725f299a5/nuritowefuleg.pdf In PDF document text
    • https://shindah.com/images/ckeditor_img/files/44669028439.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160e88ed29141a---7930067573.pdfIn PDF document text
    • https://isosklo.cz/uploads/zubokidumolelinarokudevo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c4a5989d63f552a80debba6e025023d2/lonixidimivevalu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/53864c30f46822848c02c25d1ee9ace1/35860059873.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/39874358478.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d5f15cb38---66494010604.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd580e1b4d---72564673926.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/sejezibufifuxorodo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9u9pjnmofptv3svtp29oumq73r/piwemodekede.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/uhfo09idu8kdepucbjnlg1lcsk/96946528125.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/14991419215.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/7830116473.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608998bda0e3d---60345398893.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/mexebetamedomi.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/9600221431.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80096ce227---95374578887.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/mabunobokekesozifina.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/37873604461.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106230844114532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=parabol+%C3%A7%C3%B6z%C3%BCml%C3%BC+soruPDF 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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 18644 bytes
SHA-256: d343aa8ea3c253a1b80ef9e6da3bfa8db8df5a7ebb9561fea929e1db7ef361b7
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 10748 bytes
SHA-256: 430d8e466db86f90a4a50cae159c7eb068277e9e6f4e3b031c7f041c2ce48fd8