Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccadf2c3fd6dcf2…

MALICIOUS

PDF

97.2 KB Created: 2021-07-18 09:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 08ed09197d58807f0e424b984c7a768a SHA-1: 005c30835c3feda3f378f21592a7af371d96f102 SHA-256: bccadf2c3fd6dcf2bd8bd1bb3607ff24e2ab9332fb2ac603d15939ab9e3b12e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50cd81dcd---gazaxikopira.pdf In PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbb14b627---71423793361.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9339f596bb---rijew.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cba9b0a2801---59126774476.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b5dc8fa3---75969980085.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c3a9da19---12240093424.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/60033086056.pdfIn PDF document text
    • https://domilot.com/uploader/files/nodisezagutize.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/muledirevijosi.pdfIn PDF document text
    • http://iccarrentals.com/files/file/89727906937.pdfIn PDF document text
    • https://ubranni.com/uploader/files/verulezaloges.pdfIn PDF document text
    • http://recviem.ru/img/upload/91199372183.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b133c4803c8---nonavabapuzuroxov.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/dd11b7de5f7a541c7e7c7e4b3c96fdf6/fuvoguv.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bfboujjsa3ibhfrb7t2im0ac22ejsdk1/zalik.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/31970613054.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/tavukofufu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/470aaf2efa1ccc62ea8ba1325a0477a3/99657436584.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608531faba092---vosugikevojoxarusirer.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/35280578190.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/0ua4avm2kncgduagd14dt9b0f6/48927735785.pdfIn PDF document text
    • https://equinox-e.com/upload/files/84802131243.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/11197223543.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/fcde49896f1197bf6bf8078102c4d29b/pegudapojedopij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+places+in+banffPDF 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_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 10448 bytes
SHA-256: 259532039ecf9e2df07f2a2f1cfdc02609563ab23cd4e50902e7f01c2bcf8b39
font_01_sfnt_off0001327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8D 16748 bytes
SHA-256: 2d8292b0d196ce7126a8db4c79bf1ee8cdacfd82f84a6fd0e55336cc9e1f0409