Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cb0e5af402043a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 05:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cca13e9bfea4f6dbe83c7118eeecb78 SHA-1: db1d52308fab732017319398c88436d4a197995b SHA-256: 12cb0e5af402043ad1fc99c4400bc9121877f9895387ab0cd99885e90bcbfa15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Numerous embedded URLs were found, with several pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple links and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5f9f3a3763fa8ddd5f032ae4ff9846f7/2685256646.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fedde160---vezuwitizeviguzavesolim.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2df83c88c78321814f57d934ea5fd7ee/51243000351.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/3486965251.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88d3262ee---28616333643.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bca70ec5566---96077403724.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbbfb2ad1---2687175902.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/34900981462.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/43a99a171b74a52383e0ebfd3ca35172/gabubujatuvap.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160acff6daa214---75332963494.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/dokasis.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/25810943878.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/wadepo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74cf8555bc---wukisapojepavafuzet.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/66413815946.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b00590bc6a4---dogegodugopalerosifipe.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/47862274736.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcffb5ac82c---retoposab.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/31128335533.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/13637bdd1abc62542bda67f23d2da920/63839826599.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/13200893188.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4f6425ca---senibosabuzumeditamita.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/zejixugugab.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7fd06ede---24119015661.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/dasejotogixerajane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sindrome+de+klinefelter+cariotipo+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_off0000b8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B3 15812 bytes
SHA-256: 7165e42f22d601294cc6718a9ac6bc12a17de990caa8c5dac0469ddb5730ca13
font_01_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 10780 bytes
SHA-256: f13163b69d4e6100e61ae0ae057d26533b8d1901f80d2bd94b1f8ca4194140c2
font_02_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1