Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a50f7bec1acc4…

MALICIOUS

PDF

84.0 KB Created: 2021-07-27 21:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 48c14454a2399b9545de8a090db7e4f8 SHA-1: 11d30ed713750c11b68ac0440a17f9d83c15b23a SHA-256: 825a50f7bec1acc421d3126a3c21bc5154a3a6bf14430a5d03644a9769c65bce
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links pointing to external PDFs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The 'SE_MFA_LURE' heuristic suggests the document is designed to harvest credentials or session tokens by mimicking multi-factor authentication prompts. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89027164446.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608344b9c982f---4320304369.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/majeg.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c56bcfa8---xiwozatika.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80f1daaf5---sokub.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247c5318f0---85128586017.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fujiduwotavu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b17090ae75b---50558910089.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/46epkui97uq01832d4or18qtu0/43423618079.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/nugosifiwe.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8c9ca8d89247b382ce4d2b7727ea74bf/27669370969.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/24414108231.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddd2db34a---60271070253.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/24953683750.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/nagixedu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/93633049012.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18726668804.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/16614742400.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961addaf4f6---34809285120.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc151da6a21---pumab.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/913db43d8779299d762fe7620ce4e4bb/xabelenebazegizomoriwi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e9ae20a796cdbff786f785547826e16e/dimit.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a7f941310e535bfe8547bbe5668a67ee/refof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=google+account+manager+8.0+apk+frpPDF 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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 11192 bytes
SHA-256: 3f99a94ea13aecf65f0d2b82c96aa9f1e536dc0c99af6e988507a1ad50b9352b
font_02_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 17280 bytes
SHA-256: 69ef372d20be133aab8d6bfaedc6b8ec61f556ac82c7e2f6df5c3be4827458b2

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