Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d84a0ac2d488a9…

MALICIOUS

PDF

76.8 KB Created: 2021-07-28 00:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0886e448e88770eafd2ac3025f9d66d9 SHA-1: 5977acc4c6c1592719cf36a3dbb8ca7176acb2af SHA-256: 49d84a0ac2d488a977e09d52e5247b0f8258516c295f799b5fc685d2d9b734cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/hnc17j173rpvovoven95skt72j/xudamoxolixa.pdf In PDF document text
    • http://arohitourandtravels.com/userfiles/file/bolinufup.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/godiw.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bb463b319c5944885fc7e4e82acb2427/28484477746.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c6ud2agojhhkd8blg21b5qlkbh/41064455876.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/kolabafusojidufuboza.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/gagubitovo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/299c24acc464cd67cb1e05471b86c85b/xelovulebepejabin.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/rupujuwarive.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b7f89a516aeb0eb80338660e05d3fe84/81753326360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab27e2099---xudagivanenerujiri.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/74758676909.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160802db529c7a---tufetubebovukonezozupu.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/57328643060.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vanowuruvonoxifogipijom.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b1e32706---80390680148.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc05495fce---84253131137.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/73268249276.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/sodakazimowumotubudiz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4857c4fd7---55944430372.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d8e426b1d---mobuvujodu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210513022923.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/67128754254.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/77497482297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=oxford+bookworms+library+level+2+dracula+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_off0000c761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 16232 bytes
SHA-256: 36eb0de5d1d89bbeef479e4a5f81f3131f4c2bfc6fba6ad0375f758046461d5a
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 11424 bytes
SHA-256: e5ace44c5ddaf8e3043ae06d3e64e0f6393f041ee29a1632493902a613ffe27b
font_02_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1