Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe18d3472c94438…

MALICIOUS

PDF

81.7 KB Created: 2021-08-17 00:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 827a664b9dc16c1be915b1eae15cb288 SHA-1: 93290ee5cf079ff21b293722ca5f63ff1b73916b SHA-256: bfe18d3472c94438aa9837356b72ee31d2a375c9822358cac468441031a403af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a distribution point for further malicious content or phishing attempts. No scripts were extracted, but the extensive use of compromised hosting for link farms indicates a deliberate effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=how+to+reconcile+vendor+statements PDF link annotation
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cab3b794c1861e23e623cebf2ed4d5b4/vifiguboriz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da47b3c3e8---32284580832.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/getudigadofawiv.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cabc6709c56---gewaxi.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624068737910150140.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ol2jseotjqcvfand0olqmq0q0i/lizarowumokagu.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/jeleruv.pdfIn PDF document text
    • http://recrute.fr/files/files/magumaxazobamorugi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ee56433d990d7c0323389d406845b8a9/sozudizigofukezijizib.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d014a62802a---rafokobudegezuviri.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/89888036650.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/sexefevenomoguxibe.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bf116d10394b04ab1536dac11a7d1d35/rizosuwinojodoraf.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kreg81dh5bl3h2ll7iqhppnua5/tapawikelifetimo.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/fimexite.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/luramekutenimapix.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7060af8a---mekonezi.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/48219582464.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e514e632e7---xebatiferem.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/12552790700.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/33a1fc425a2059798b931ecdb93cc655/67248631427.pdfIn PDF document text
    • http://robedecreateur.com/img/files/jaturitixexesirujobo.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/13900014434.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16588 bytes
SHA-256: 261a24f5d5ac42de3ddfc463c1db314c96e55de6d81f73d2ece3c2fc1bd70c80
font_01_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 10672 bytes
SHA-256: 2fb3def16384a699e128c2e733571584ec1186108ea218f091577bab3c0b3728
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1