Malicious PDF — malware analysis report

Static analysis result for SHA-256 672467e5f913c35f…

MALICIOUS

PDF

101.0 KB Created: 2021-07-02 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d106b98152fe749a9fce1ac26ca5ee03 SHA-1: 3d2c560cca54b9fa27523c9d8e51863408cac407 SHA-256: 672467e5f913c35fac6ae4b0eeec357746ed2b1bcf809376edb50a420190edea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites that host further malicious PDFs. This indicates a link farm attack pattern designed to lead users to malicious content. The ClamAV detection and ML classifier strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c61488173---87668781617.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be413a7891a---xobolebajifapirudodokuvin.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/18318370207.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ud6gilvpcophdsh1o92n5k8tp0/47961219529.pdfIn PDF document text
    • http://splogservice.ru/content/file/punopenetawolaferidugeb.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/44774057209.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/82071276730.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7987c48abc---86064402802.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/46064675272.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/83dcbebe87a292d7534250ad8406ef4d/purojavarigatudolud.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/wazuwetegurukevoxepixefa.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/tofusepe.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/08d461eeabcca430c06a5957939882e7/zubogoruzafenubitu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609a28e49e383---dufanoxofipaneterezil.pdfIn PDF document text
    • http://castel.lu/userfiles/files/36219416051.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/mh12rsshmhhs42ssnhlnme3kc9/86265611319.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/10008773941.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/8cuencgkhk8b8fnqi7167dhv24/dokukodolojomusip.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77609bfb5a---38623408870.pdfIn PDF document text
    • http://apsons.eu/files/file/62819301599.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e163149db2b0851352445b0963ac0b9e/valojejixoz.pdfIn PDF document text
    • http://sooclose.eu/upload/File/tegafajeravikewikeloko.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/65891184437.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b76501bba96---tawatijoka.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/pipotopokozenaw.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608245c44481c---74805787282.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50888a7b2---zabamuvimeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vocabulary+workshop+level+c+unit+15+completing+the+sentencePDF 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_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 17092 bytes
SHA-256: d43c1ea5d3a6a954ffbae90443248be5b5ebe965f3df9ac923d7b18b2154b07f
font_01_sfnt_off00015096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15096 11572 bytes
SHA-256: d1e04f0028418a6228937296da317e1c23161eb4e1bcc1ea668d54b3e5639d91
font_02_sfnt_off00016be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1