Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12c17bf716ebad2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 22:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ac63e3a3ba01112895509afac2271c3 SHA-1: 90b6b77ede60d3ae2df4edd081a1b8a14159fee6 SHA-256: f12c17bf716ebad26560622e02ad74af3274d754dd52474196c94c2f4b42b865
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it functions as a link farm to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=ldc+result+2018+pdf+download PDF link annotation
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/nebunoterogigura.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/aea870fbd6fe8bfbdd493747c08e3056/zegigazuzupudegawojo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/mfie2i55sv09q5mu4730lska9r/3221022666.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/xaxetituwaj.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nuvpnimnmib5ns69dqtek1a7lm/28258248310.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7eaadb913---34891573453.pdfIn PDF document text
    • https://spacio.hk/attachment/file/zetubafanitupigikawemo.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/zovoropawivenal.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/pareburazodunegogazelos.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/nosesudimogonosixugugi.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/88992979174.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/41186989216.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/68077097349.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/39846723570.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/13306535424.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/57903932554.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139c8a83307---kefinetilirujetule.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/70e705b436a0c98fdd1b0fb703bd32e1/lozutalowinuwor.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fipeponafubixa.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908797d532---bagatidudutubinedagike.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/zenodaza.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/n19876mjt6dbv5ppks9t35bb07/69307738925.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/mulitunajasugadelosexuga.pdfIn PDF document text
    • http://nfc.soo.jp/file/15787507737.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_off0000b71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71C 18056 bytes
SHA-256: 27606fd808861189acd27116b031a09a192360523045ce2fe982521e817f2239
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 11164 bytes
SHA-256: 6f53c66e27f6966c05ab85383f35e9b3d5fb872d1a3f3904392e53e8e8abe36e
font_02_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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