Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf69639d2caa01c2…

MALICIOUS

PDF

84.0 KB Created: 2021-07-20 12:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 886f608e60f195348efe453529f8f1e7 SHA-1: 2671cb38b9629228fa616c9bde16dc412cc01723 SHA-256: bf69639d2caa01c22bc49474c1fb685cb0787b2eb5d1e55cfe944ad12718284c
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains. These links likely serve as a link farm to direct users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/guwavonitotodo.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/209a71a568198744d8cdacdde4dddf68/64664335992.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fejusafesibogujosuvel.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/03/file/20210603_042518_161.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/17247495203.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df76524c1---95170612986.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c47defdacece8ea0a0083ce0c094a5c6/78409549632.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859aeb2f45b---17086133095.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/leram.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/nupaw.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa84e1b35---91082044893.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8nppshphq9s82ef677ue6qrdq0/29603432386.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/forumisego.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/38716397218.pdfIn PDF document text
    • https://renault-service.com/userfiles/91909828993.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086916cb2d7d---kemamilesokopogidedudixu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494ef912fd---84513930626.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/45521572999.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/25415094342.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/zewunadinavuzefixuwedine.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e05bca75b---zesapuz.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9d0c7153---suzikukanonawunebov.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f32e33031d8d28b78e9717ddd840e74d/62664750622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=there+there+theirPDF 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_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16592 bytes
SHA-256: e9fb5fa1cf03c4d52530a83ec510f77d3fa9e32e4852c7089dd8c6bd689de726
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 9568 bytes
SHA-256: 8512467b9e0d31940b1ddfa3b164c371089118d9f28e8d12736cbf51bef52b1a

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