Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be44a06dd2e1f03…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 15:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de0722a0bda7fd0fc2eea25c15875ffe SHA-1: 0e1b3f8b48be8efaa37bc648a6c5d408ae4c9979 SHA-256: 5be44a06dd2e1f03e4ce6b7df2f08fed5238c5db016dbb310742e0134535c7f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The file's structure as a link farm suggests an attempt to drive traffic to malicious or compromised destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://giriconsultancy.com/content_files/files/44033101753.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf4a90dc2---vobamuxomibosep.pdfIn PDF document text
    • https://ksuskalology.com/images/file/nuzexabevapoko.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad611b9c8---84453275613.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/98132535565.pdfIn PDF document text
    • http://aven.su/userfiles/file/xezikewijivexejopivoxe.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/vimagitebimekesu.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/68822416076.pdfIn PDF document text
    • https://mcsfood.com/images/file/pugubunebefufex.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/movazozekebojuwajibu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/bedame.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/kugoxawudemura.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/lunave.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/lirare.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/dojejabuzawatuwitiduga.pdfIn PDF document text
    • http://1careglobal.com/upload/files/lutukij.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_21F3932A3A8D257A.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/26854055574.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/74135718280.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/nadedadat.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090522285670693.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/20211360876.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bixurinedosabo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cnvua1kv94p6n0cjfra0jn1bri/xepoxaraxusezage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=apk+kamera+terbaik+androidPDF 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_off0000bbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE8 10552 bytes
SHA-256: f419cf252264c7b511edf5a7a5b9974669a04f2abae4930ab557d01a178864a1
font_01_sfnt_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 16996 bytes
SHA-256: 0c83fe8c7ab256718a9c0c3268dd93fddf4a3e6e5942364f6e38845fd78245cf
font_02_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1