Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bdec7e620386f6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 22:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 496acac504380918333c05c38988f97a SHA-1: 4a44befa589013c29a3c0f4dbdd750c39404df14 SHA-256: f7bdec7e620386f6f4dd5d9510c8becc2c8e0ae844da73e5d3d2349b283d3762
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b931594a2f7---23891054444.pdf In PDF document text
    • https://aiaciran.org/cache/fck_files/file/38156340091.pdfIn PDF document text
    • http://ecole.ru/text/images/file/vasalikefamudanu.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/surepova.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/15477427122.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/bd0a86250e27a4c3d4a795fcb9189a4c/vujixusi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvo71njgsgbvokd07d9lecmfln/78450101926.pdfIn PDF document text
    • http://talleresjpg.es/img/file/bejuvag.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061518563865.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/zimedenifoguzuvoxap.pdfIn PDF document text
    • http://prosquash.by/data/86869792135.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/wivuzedalisuliwafe.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/2564958615.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nivofilepinefiz.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/pixatixebejetavuwexuwoz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/babefigunu.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/nesugipizido.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/r8sgv0ie6hopi31rr22ct59fbu/56788389975.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7ea659944e3038fac5bb5ea2fc446887/48651335869.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/kises.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a05af40c4---tirijinadixixibejutu.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/kuxunefo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/70868100160d1dc3540410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cursive+alphabet+worksheet+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e76b068a11f608fd1041c08a8ee6d06f/baxowanufabafak.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_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 17992 bytes
SHA-256: 70d3f886995e930be424334bd43fdb9a9b79f7c5d1e37f8683d73cba1a61e215
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 11008 bytes
SHA-256: 9a5a83e04ca482ff06f94fc3c20d0d632e859b9d6a38e96f19ea2acdf31f2d72
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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