Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f239d0599dd86e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-23 07:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b2aa6125d2b5fdd67c4718098a5d9d9 SHA-1: ea4c9f0676832e4df9437c2bc9b1eaa1a238908f SHA-256: 99f239d0599dd86ea6f6c615f2ee1b4f387db204a7d921e93cdfc6a15e76247e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gancza.pl/userfiles/file/nomizi.pdf In PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/5687103411.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/10408803853.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/rowedif.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/640c570d33714a51112416fd627071bb/woxejemob.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/nepodiwofigekokukarafodek.pdfIn PDF document text
    • http://cbstav.cz/file/raxev.pdfIn PDF document text
    • https://ibericadearmerias.com/file/darebagitanulitejagesuvaz.pdfIn PDF document text
    • http://ip-kamery.cz/files/file/xuzun.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/3553241898.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/91360374772.pdfIn PDF document text
    • https://digireg.com/upload/tiwevisirujewadexex.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210903_62BC4E9F66EB5E2C.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/59688829873.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/tekukejo.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/28955719365.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/juvevo.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/16847338800.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4058277c.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/xeneviwudusufat.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7d274c49---zadepimimidezeto.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee15737b39---wiragejiralos.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/27566834176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=using+middle+name+as+last+namePDF 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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75F 10376 bytes
SHA-256: 9c34bc53c72aa714e3123e9dddb8c1516a3482c50fa2f43cd190017818a4b19d
font_02_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 17468 bytes
SHA-256: 9ebf02877bd660637deddc51341b4615fe2cbcfd2c056048934f07d1f6105582