Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eab70756aff2f4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea34c1ffb40c585cf9d45bb160343f68 SHA-1: 3e83db91a217a9f50ae724c7601433a29a913e12 SHA-256: 43eab70756aff2f473405daf3c4316876b2927b3b4a6d57711f13bf1bea2503e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, indicating a likely phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with techniques used to obscure malicious content and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://solener.info/ckfinder/userfiles/files/63666746038.pdf In PDF document text
    • https://avgdesign.com/userfiles/file/47208410700.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/59992326183.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6ff7ae18---sorokesebuvuxitoxobabokor.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/48396916641.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8cbb466909439a25600316771362cd97/27735296918.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/52422605006.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/jinafuwimomerusuvivaduril.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbf78c6c2b---netunewivan.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210731_034908.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/dcg6p39ui7a905oejptlv7lrdv/14833858874.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/jigigabarulireja.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/91429514811.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/h0jqbqggo7v537hqa3qqpof3kv/wokiru.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab3e8adc8---gibixefedos.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/baxixemiwitavivit.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/12192798971.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/boxomopabu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/af10175cf435a856ae2458594c0094d8/nejevelosifewifozabinoke.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610808023c7c6---tanofaza.pdfIn PDF document text
    • http://contelex.it/userfiles/files/gadakogapubumobakuper.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/61809479547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=t%27s+and+c%27s+meaningPDF 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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 18364 bytes
SHA-256: e5b5613a155a672b8f0d1a7fccd6edb2e28f1f02a4ad7166b6dc56ff54dd4391
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 10344 bytes
SHA-256: 4dcb6d0c81ee66b038a8a4224e8c09c5050c3f3812cc7540ed8e683fab52d321

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