Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e619fcb1d28a71f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 04:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b9c063df06df34b88193a46e96512f3 SHA-1: c0889e65e5b384464f2db56530a0101154a1e5ed SHA-256: 5e619fcb1d28a71f4f439e7134b3e6c72fd967fd2f412c23a39e19cb819c0c65
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, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c67f1c55dad---girojinirufalufekipe.pdf In PDF document text
    • http://gniortho.com/files/Upload/file/85160428017.pdfIn PDF document text
    • https://masihpt1.com/contents/files/sesabikosilitafifox.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba0f03950e---69248748689.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/0322dj1oi6qcpr9pergrtf3th0/37200228737.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/43313362069.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/33523631644.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160963c3d38793---27702051770.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/25731484880.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/4agm02ip7p3n9a9h5j9grmm1li/kakopolesutojezusan.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a53025ab1---47286608091.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/76482569068.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/nikaligomizerulo.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/56509525450.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6379f1f90fe0c770384562ab2631dd00/fabidagomuz.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/sirilazaruwufi.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/kanavapadetatugawerusufud.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/53808021190.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609939fec6f6e---23003868289.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/n387su79lp3d4441b9eb32ie55/99426159473.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ee213029f918a3eebaf6a72c819bb669/27695541172.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/kogiguxaloda.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/16975051161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=le+portugais+facile+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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 20260 bytes
SHA-256: 315302a1f7e160cb5c5fcd11b98f0f2972b1565e9b2d58f83747da8a953b3703
font_01_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 10748 bytes
SHA-256: cdd291bde458f2caad3845472381e1d5c0c42372b2dfb9953fe4febb6fb37439
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1