Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fde02ddca11ec8…

MALICIOUS

PDF

72.2 KB Created: 2021-10-04 00:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b74f64fe386f0bd85e1168e22c3e3c11 SHA-1: 585812e119f547645c643ab831da296d9888a9e8 SHA-256: b8fde02ddca11ec828b90be2adc6a899a35814a698f4a3db6d8fd28115cf2207
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://balajihighfields.in/userfiles/file/20101940394.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/dolapesipededoziwuxafurit.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/dutab.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1632574867lanixozit.pdfIn PDF document text
    • https://kawanmto.net/contents/files/47024696243.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/24298236034.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/wivijawizixugaba.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/movevozuwotatofonif.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d8a02b1784e43504fa7ce41234667f9c/sinovofegobafaje.pdfIn PDF document text
    • https://forumsevens.com/images/file/novejakozajifixesiganej.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/zujowasefezixotokazima.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/pumodiwujariseza.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109022105461211079g0cjj.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/63e4ea30944d5f0d0c58e039b5f03f27/xakukivofawexozelujuj.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/19467391837.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac5086401d---wovogabaragasozojibugowu.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/benuzob.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/fosivuririjubotoko.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149fa507ec29---70954534523.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/be7b01160915cc6c00a6617f52cfdf59/11666588731.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/zusavagusogoxobironuzivez.pdfIn PDF document text
    • http://schokozentrale.de/idata/64036924538.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l3ifumij11tbajlspa46395bo7/70737507791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=radiography+test+for+weldingPDF 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_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 11020 bytes
SHA-256: b09445c9bc94669bb0c910b4ac0a2cba3cdeb600e5b75febba4682856e8edf26
font_01_sfnt_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 17704 bytes
SHA-256: c234498b709ca6bed679631c1e920f471adf5d6a06604dffc5b70448692f4670
font_02_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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