Malicious PDF — malware analysis report

Static analysis result for SHA-256 10df70be851bfe92…

MALICIOUS

PDF

107.1 KB Created: 2021-08-03 01:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 786c66fb700160cf1ad0190f5c71c5fd SHA-1: 13e8aaac75d6a180919b5f421c38df2dbea85539 SHA-256: 10df70be851bfe92ebcfe27f459b05cf9410721f025cc5169145219e5ea7a4e5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ferramentabelleggia.it/public/file/gifogalolenegabe.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf51f59a4d---jidune.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e53202417---laropotowebosudimupal.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/vezojusilirodep.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/eieu4sbjpq9693gq7fadrvptaf/76486872121.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/95880920540.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/jomanomenoboboliwanefa.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/dinuvala.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e1be0aa8d7a11b623e89baaef597e1d0/gobalisudokadelajarujoze.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mpfaftnritq68p00k9t11mcph3/novutofoterubifuduz.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/xevawezedez.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e2ab263b04da9c6cf9dd2b1874058818/1308924492.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aced9b712e---kimimufopowugesetiz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e84237e66d9---vevirako.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/28772766690.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc79a8a3bc---2364790711.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609341ad78987---35567344220.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ce6c836f655605262e6beb7b01eb7a29/92551491761.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/54911249336.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/litutu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f1ba400b---14289415990.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e71c985423---pekebazo.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/69790663911.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/55802885809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+v+bucks+codes+xbox+one+generatorPDF 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_off00013ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 10884 bytes
SHA-256: 8d2c996b22bd3a1ccc02b50e4bfd688cf45e916cca580747b45ac2a7e6024a6c
font_01_sfnt_off0001581e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581E 17884 bytes
SHA-256: 5f56ac893f8e00e95ecc332d2d665c5e3fe5c0a437ac815c33e0fa02f0fe0d0a
font_02_sfnt_off00018648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1