Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23f12a3c63a9d35…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 09:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 920ef6287d988042087f40e844bdbea1 SHA-1: 196b66fcb1cc7c36b2de5801ff00cf1a68518320 SHA-256: b23f12a3c63a9d359243924196c80224400d68e53d0cb0f862a018bdbba1f146
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The presence of a 'link farm' heuristic suggests the document's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=mlbb+free+skin+hack PDF link annotation
    • https://misbahelmudii.org/ckfinder/userfiles/files/59144488505.pdfIn PDF document text
    • https://jck.ro/userfiles/file/45242813111.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec9ea3efb---52088383320.pdfIn PDF document text
    • http://tykhchem.com/upload/files/69704590795.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6b48bd0---5799158959.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/54363741147.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/kogalagirigowa.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429feee5495---90754115941.pdfIn PDF document text
    • http://ned.ru/uploads/files/mizuzuluvafomiwow.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/77a089784fdc2f14f628600be387aaca.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/58403644323.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/8333113763.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/bupekurotepexofuw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8f09f01d---suwimu.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/26149824734.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/33701306901.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/safoxuv.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161490450b2b22---fomevejowakazusufoxofeb.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/82511278472.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141452bd28cb---37790422132.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/84929297952.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/xatilatu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bd33570e1---befifabexijarudotunixate.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210913_1CA8DE767D0C9E61.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/58783854191.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46493962481.pdfIn PDF document text
    • 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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 17692 bytes
SHA-256: 32e766e6b8dc62c06c7d81e783e14eed61041fdc450b0e809a6258da7d3819c9
font_02_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10440 bytes
SHA-256: cdfe34ddb7f493bf880631974fc4f1ea828eb3ed9d2d45b13bf9194fafaa1e85

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