Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf5a7d11b17b260…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 20:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23b2ae4679c443489274989fed003437 SHA-1: 3d3d491a443c4b33d7a6c559395a61a994685e2f SHA-256: bbf5a7d11b17b260a287776e5d2d5074b639c6f362523f1bba220db52d46735a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, utilizing an image-based design with embedded links to external sites. The heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=c+major+add+9 PDF link annotation
    • http://star-transform-moscow.ru/uimg/files/71053343004.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395bfc75232---4715996814.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0909/d900e0a09bfe901411cec194f898318b.pdfIn PDF document text
    • http://elpijisystem.com/file/dedam.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613f9de18b991---lanixipakix.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/63741972240.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/36669581353.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/81627892532.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/tupupineniziz.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/36469630632.pdfIn PDF document text
    • https://led7.ru/file/funexotesajanaj.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/daxubutovujakikapoxopala.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/66709083063.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/612fbe4f5de9d4abf8d1753e66a80459/61615386145.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/70315765928.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/koxiwobubup.pdfIn PDF document text
    • http://uteambio.com/upload/files/rimigumodimoledakogulu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uino4i5fn6g50tlahg0jf33s06/faxikubekisamebawegixos.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sepizoji.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/27255982898.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/94447920648.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/redetifipaze.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vizipekusoso.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/tulivuke.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/2339480812.pdfIn PDF document text
    • 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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC939 10100 bytes
SHA-256: 16b5e5f83fa071fd1161f278ba675f91ef957168e8d1cab7f6b2c9a95e7aeb68
font_02_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 13840 bytes
SHA-256: 81a4adb5f3a22e91b85d1b5c397c4690aa3092bad3ea8811079403b692044753

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