Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffce66ffca7277d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 01:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d2bc58411afc4a25af7eb25ad934efa SHA-1: 20eaccc5ebc90efcba0bfe8f4a1d356980852088 SHA-256: 6ffce66ffca7277d3986b5d118803a874d8dc18eaf4dd941cdf38f37d38a3e36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kimtuong.vn/isc/public/files/fckupload/file/42203760551.pdf In PDF document text
    • http://papinchess.ru/userfiles/file/89456090817.pdfIn PDF document text
    • https://roshindelivery.ae/userfiles/files/sabakaton.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160bec364c9423---domaduwalakejeturaxu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/kibesuvuzewemobogudawofig.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9c0f75d55---nevijuduxemogirim.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/75du3b4drgtk8pf0j7ojt7tujf/julumodewosemudevit.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a99c49cea265706363e6a63cf53f4719/4676938394.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160984aaa5fac7---98604655247.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c4aced22b6b505e28af9441aed3ddf28/49954434564.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4a6cd16b7---dafipiwuse.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16124db343277c---rodotumitise.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160936a7c1c1fa---42580594379.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/guzosasawofififusu.pdfIn PDF document text
    • http://timapools.com/uploads/files/vixemereregeb.pdfIn PDF document text
    • https://actorconseil.com/files/file/jozigefusoluroreju.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/78574397425.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210517212720_v3ttzn.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb2d635c98fbeafe1518c967a4315b15/97762591066.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/41425139624.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cf9acf232---90627718749.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/ferudipajozasufesuma.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ct8nv8ih2u2hp6go7oi14p5ad1/pavetelukagokudeluneduk.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070323e7f94c---75265536653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cassirer+kant+vida+y+doctrina+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_off0000b950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB950 10872 bytes
SHA-256: eb873d6cf4af76d8be4e000d4a888fd32b8fdf7687c1f6aca23a16a6f45e463e
font_01_sfnt_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 17420 bytes
SHA-256: 87b4e458571fb534624927514236d63ad60458fae0ec5e5430bde9c1bc001c82
font_02_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1