Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cd24e41771d9d6…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 04:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09f4f647c9e4228ce9b2535d53128f8c SHA-1: 06b331ef7c6d036f7a9e9094152cb1306f451f5c SHA-256: 78cd24e41771d9d60894736495371fa6bc3a16e566d4eee8738110fe14a0a4ca
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to numerous distinct hosts, many of which are either compromised CMS uploads or hosted on disposable domains. The embedded URLs suggest an attempt to lure users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://udmvdpo.ru/images/files/sulotuwevedosurinuso.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/61443347391.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/mfrg6luskokq51srifo4m1ghh7/96046142928.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/71170703095.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nasofafumufesolakidejuzi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7f0a48c0---poxudawogo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ccf7eea04221c3de0f9a3c64f90f7179/71127012931.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8274261c---58408132986.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae6859e68---benezupijidav.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102b7e3222---41228697836.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vagosifoxonomuxe.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/60310842279.pdfIn PDF document text
    • https://esz.jp/img/editor/files/tamobikiwojebudukanexo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/80138618485.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/941cecf038472af2c5e43e01795baf99/wolibu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0rfpvhklgje0ja8270u7ce1bmu/56886327193.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a3b6d12a9---10009544899.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8ebh8pk0vbks001aqschi4j0g6/mogopipedibepurenijor.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/708js1u3bstt6k63kqjqplieh9/bilotakegoresunara.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c28ec6f041830cbfca2c74ae57033cf3/kojufafirov.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mteg3ir819st2tbbqtd0lcnhcg/sixadumeniwezi.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/90977192925.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77b186a9d4---16096793427.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd68a299d6a8c4d16ef7988d27ddbb9a/2699260979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=differences+between+john+and+the+synoptic+gospels+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_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 11372 bytes
SHA-256: 690582d9a45181c86d854b36e1ff45beed65781b5025028323ff44d8c1c42228
font_02_sfnt_off00013005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13005 17764 bytes
SHA-256: b7887a3762ba333836c57ea6db0c35075e30e001a17c55996ae317d120e4b6b2

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