Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ff8b4897f6ae3a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 11:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa0e9a5caad10b1dee886d9cb4e95ff7 SHA-1: 8bc07ad637e611cc7f3147ca676cc70b14d1822a SHA-256: b2ff8b4897f6ae3a94424948b20f01b0a69b3c05600da276d3b9062c4fd26019
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggest a link farm or phishing campaign designed to lead users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=best+free+android+tablet+games PDF link annotation
    • http://whdhgs.com/uploads/file/20210910204458993.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/52970202712.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385caba71b0---fasumalem.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9cd80935---14665733906.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/68420037867.pdfIn PDF document text
    • http://kotolantopeni.cz/file/67724148783.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/56121967775.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6144FF3F1B8F8.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/muvajujozunujapipuzulezet.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/49943028920.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/41958089432.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb66b136e4---kolamifew.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/89489122274.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/zemabikukuwuzevomalu.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/93141843232.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404a3eb07e7---83127535910.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/19911884271.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bulemesewogomaz.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/navivapegomaf.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cddc61f1c3---1676816297.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/42270581472.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/19496993802.pdfIn PDF document text
    • http://staropolski.net/Upload/file/tiborodu.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/68682961827.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_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 10888 bytes
SHA-256: 3b0685dac0b5ff41f5a4970a5431c4150f8a547ba1b895c0ea2d573fb95892f9
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 17152 bytes
SHA-256: 65144d5055cf62b5ee6dddf3d748390d877654d2ebeac24698c3f26edfb37337
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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