Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af60301e306159d…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 18:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1f748db613a2a1932db8947b2b7076ce SHA-1: 3d3c4f0d9a3ed924fc0d37933eabfba92a8470d7 SHA-256: 7af60301e306159d080aa311911cd49a572b7a4b0477c47c8daba636682f2350
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=protect+excel+spreadsheet PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/616a310e76aea41eca7a497cffef661f/238104888.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607428b7530d3---zexefe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/98751c1bbcd960d2c007bc78cd8d28d6/zugeterovaw.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/logobibefimozogegasi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/35341c95c228e451f8f5c2ec15d6e869/pipejinugofawa.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c20a8bcc0---36120907934.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/nokusevudofepamazunuzaje.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/xugajasop.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e60488de4---bevezowoxami.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0871d2dea---96927139387.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/53864115407.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95bdaac0d---6815339469.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/43890674034.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1f93054bc0cf5ee9eec816a3bb859ffc/1644005760.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/115872824260cb51aa3c815.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a08cd286979---54939386194.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5240b62b---vobovukiliwamek.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/3956182616.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/53634379100.pdfIn PDF document text
    • http://kbchina.de/upload/medasubulewed.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/86902276448.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_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 10516 bytes
SHA-256: eda04c8a2e252205d77ed6f2e96acfa850c9448278db8e281a7afba2bf7f14f5
font_01_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 17484 bytes
SHA-256: f4a1c95f98eb250801e2ddbbcba933aa9c07e89f8fc520f99d1440a8ad0af86d
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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