Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0e9e7b5fddbcf3…

MALICIOUS

PDF

76.0 KB Created: 2021-07-07 09:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 68b1c14bb9056b48d627edaf8f83923d SHA-1: b8e6b84eb93d96e9881d158340879f188e819f13 SHA-256: cc0e9e7b5fddbcf3b0f3b537a178506d6d516a039b7b79ba35f1acee082c1f65
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised WordPress sites. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a06a99c7---vakofekebekuji.pdf In PDF document text
    • http://soflocops.net/clients/81266/File/muziboxovuj.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/155c3b5e3b1d9ec4a2032d235664ab6a/36572211383.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3f1qkrehv22vcejemjakfe4ru8/sarojomomaxesupadediba.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/66c276514439414458f55b67df595f9e/kokojukiwoxajexisero.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c74c971a---16885044669.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ab4695be3e886af9a3a42e6b60777273/gomuwofugin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/30113fc4d7e06fe966953e2f8c12c076/xutoramojasu.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/dopidigezazega.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/67185108504.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c226e1d4b88---75478035411.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/j1amrdhgjvqdth9qg0dklda341/83886881885.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/bbabb97bd29ec2a03c8a75e53c8eac86/dukewigusawuluzulekuvola.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb58811476---lelotapitudewe.pdfIn PDF document text
    • http://berbun.com/user_img/file/16895241393.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kte8q6isprjg856su3sg3rcsp0/19691593507.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/36629910486.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vopavudu.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/10321107742.pdfIn PDF document text
    • https://pindimana.in/uploads/file/lagapikojudaj.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811019d3bb6---vuvonexe.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/96011017339.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6ff620ddd---77680820480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=that+fat+cowPDF 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_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 17172 bytes
SHA-256: 1554ad79aa394cdf1ebb7a85d921657aa49d3b778d6166dbd5a1aaac219858f6
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 9840 bytes
SHA-256: 001d924420af1820792c0fd9ea4aea0301b500861212a5fd69d024236e6b356f
font_02_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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