Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d270044abf7bea5…

MALICIOUS

PDF

93.9 KB Created: 2021-06-29 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0a1c5a31d3e7dbeb5103f7bbbaf5eac SHA-1: ae5e1f132975661d0d2cd644f46f6e8643e4ef2e SHA-256: 8d270044abf7bea5642bd716be64c141e9e19154e5828e0a1cd0a50225c1f119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c639453565---2049723046.pdf In PDF document text
    • http://magicdiscoradio.hu/userfiles/file/71831710738.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/79459290300.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/73481319443.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb328f9e4---79124641171.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e16435ff---luradudoxaxos.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c098d5744---xulokijopoka.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6126dfd8e911d2bb9d2ff0d06a1a088e/nesukevolijujuxobebupili.pdfIn PDF document text
    • http://gewald.ru/content/Files/peligusu.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfbf16b51---7734215387.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/26358331199.pdfIn PDF document text
    • http://1careglobal.com/upload/files/59462008579.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/40656993380.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/fobariruk.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/3516585459.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/ridalepuwog.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b49249e4---vekukizowenijumo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/18954259040ff05c0534bf5700b6d5e5/gegadizupo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ea3f2d3d9c57409524a86ead7ef8d9cc/91349487414.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/79088166203.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d9d459dad---49347177909.pdfIn PDF document text
    • http://robbes.nl/media/files/dibagulasevili.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fee4b6087---36424494912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=can+anyone+sing+goodPDF 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_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 17188 bytes
SHA-256: 90a3718f0245d118af1e70ec82119f323cdb2cd58280217ffa7dbe6cf5b35c16
font_01_sfnt_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15363 10324 bytes
SHA-256: 611965579b59e6ab7185c80829ebb78a5ca2883e17d6dd2ab8b971178d2f171c

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