Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fccbe0f17f728c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 16:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1b4822fd3199adc2028eb6589c73821 SHA-1: 556ad497c94ca39b78f315e75386101311d81a05 SHA-256: 58fccbe0f17f728c7415ce608bd1e1d3ddc27e54225c08fb63c0be24912cc938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on domains associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://evrofurnitura.by/elax-furnitura.ru/uploads/files/bimuxokivomokivoxujigoso.pdf In PDF document text
    • http://naturallabs.fr/userfiles/file/xuxemojedumulurebuzexofo.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dominetezipinoxisej.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/felukiduxaturisegufu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0147fcef---39419145931.pdfIn PDF document text
    • http://szpk.hu/_user/file/goxasobif.pdfIn PDF document text
    • https://megashina24.ru/files/files/66313622137.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1e4c22223b13ef7893bc3d07478f2d88/selesozeremejosurel.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836404e07d---46215429791.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/24281824609.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/sosivav.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/22964409362.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/xumasena.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ee9d4cb3978a1161a14b69f3fe43e45d/11011106488.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jizijagizuzetamimefuxo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50333128d6---91509548049.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1tphi5glfv6adknst8phjh8nuj/97253901649.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/26544196401.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/15555951591.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/98801416341.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21f559fc0---22271563905.pdfIn PDF document text
    • https://led7.ru/file/38821065866.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/47f9a0f2dadd9131bcc1a5464ff290dd/77610289914.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/57179813871.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac33274856c---53686317498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=multilin+869+manual+pdfPDF 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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 18460 bytes
SHA-256: 8c148a779d1757c3d85c16642e5e591f20619804dcc14b387ecf34ca43e9e9f4
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 10776 bytes
SHA-256: 3778d8faae4164fef1d3d471bfa8b54796f68c483d3c10192dab6f47c1dae8fd
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1