Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a78e05b5f681de…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 14:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8bac6ad5a9137d6e3c8293b07d93ea6 SHA-1: 332e23694837267e293fd739eb7a777b4f664ca6 SHA-256: f3a78e05b5f681de5fe8bcf910a25e9e2a764cba4befb42bbd265a3cdaab7789
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, likely designed to obscure the ultimate destination and evade detection. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=blow+you+out+meaning PDF link annotation
    • http://harissarantis.com/userfiles/files/mazetaxedexoxanalolim.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6a76a6a3ccdde04c2bcecba97c932505/wekepowuzofavun.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744173358f6---20879533228.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/vomokupukewakumawalulago.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/1e506415178776f6b3a2a16a014304b4/perupexigo.pdfIn PDF document text
    • http://halmar.info/userfiles/file/36111041101.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bf46062bc27dc8296a3ea2e0d6aa1417/jodimogogulup.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/fuxun.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/wijivuwa.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9d34635f4816f347c43528b9f8f8f11f/zakimosodabonap.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/21457888878.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/pikafixa.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523133510444.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/medole.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4132ac5ba---rilutidasubutizox.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a5058a33---dutofekepijebo.pdfIn PDF document text
    • http://ipceurope.com/assets/file/53833779975.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/jevixerumijuzopose.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/sazedulesopizawisowonev.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/41894414814.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sexunawejazo.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/busakijuwimomanigexetutig.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/binopinunerijudivudexuw.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4mujkfdgehlht512u8p2geskgn/bupafefitise.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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16616 bytes
SHA-256: 3eed3e6856915399e71deef2b686ba090201d239967824a270642f5c90b1d95f
font_01_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13500 10536 bytes
SHA-256: c947377d9d89a81fdc977ffe0c29e94f7e94dc082c9f36f08abee0f54d2c9ba3

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