Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e50e913369c18e5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 09:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 152b9a0d8621943d8325440d6e5afa18 SHA-1: 583379eef95b381da3fc2f055617003367762236 SHA-256: 6e50e913369c18e5c7fe43768c6878c1dcdbbd5e55e560cffacdc68ee8922ff9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious sites. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

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://domholidays.com/userfiles/file/59707655884.pdf In PDF document text
    • http://sintellect.ru/Repository/file/rawusewitamaxa.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/pafebimibukefipufujig.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/11844646938.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a73291936ced32d9d87bb3ba8450fe3/90011684564.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c08d057f1---gupemir.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/4209569855.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa854bc61af---gufili.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc92ab17f---73228120507.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/5156756580.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4ff1652d---xuwizajepupidutiwerut.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/lebovfj7k4rn05h3f78pffjsj6/begesinivireza.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4cee0e0---59174550660.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/24380253509.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/noduvisukuma.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/56608361016.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/55937878052.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c5161b9dc---sizomukaf.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/woweruna.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e8b3fcb560cdcd7045cb5aa31e53254/nojoxumumosa.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a43b4c91---gagudazanagutenu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be8e48354e7---21707494139.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/jigawekigedalusozopag.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/nuwogurafowesumewafunamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=career+counseling+pdfPDF 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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10828 bytes
SHA-256: af9887f507839e4a4fca571f7c2c70c9cfb77203a10b9c0989bfff2b855636f2
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 17292 bytes
SHA-256: 716e19b5dd912c9a495872c5e5f8f2784ffc5f46d548d2ea3a27bcc56249140c
font_02_sfnt_off000131da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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