Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09d87b055f9b0b6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 12:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7dc802e18e5c655b40612887a6520a2 SHA-1: 339842ace46605b3d8bbe9257c6bd0faceae5c20 SHA-256: c09d87b055f9b0b6451ab13b6728be746502f5052b91a3415af54c6ddb48646e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially malicious websites. The presence of external links and the compromised CMS upload storage heuristic indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://smidgel.ru/uplcv?utm_term=african+culture+essay+pdf PDF link annotation
    • http://lionsmarsala.it/userfiles/files/tujekokuzeved.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b95273e19c8---goruxigakibinax.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/zomogorademoj.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f66edcb6b12---rivis.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bfb2b4334---zanuwoxemogu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ead8ec67e---lupas.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3k5v1o3cjdf48ac6sg1gte93bf/96859584518.pdfIn PDF document text
    • http://movediary.com/userfiles/file/tusutibezomivuvesotevusom.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/73301749091.pdfIn PDF document text
    • https://clickbox.ro/images/file/dazidotatul.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f8d34de623ea046e524ec861c0416696/rofibilovutufariviginexin.pdfIn PDF document text
    • http://airfa.it/userfiles/file/febeninukuj.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/rizofedorajew.pdfIn PDF document text
    • http://temple.mo/userfiles/file/polabidu.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/4263494772.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7618ca4671---55861868073.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609692255e3f9---9661477718.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pobesejikojopavoxevixome.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vijer.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/votojadofasoxow.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/66084498325.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/15617492685.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608117f490267---jejixovelanijimasexoburo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-28/20210628014955762564.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210623_DE01105B035B9163.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/zikebokosebexemasudeji.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/27888e9676a270af6fad6954344ede68/rumix.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_off0000b977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB977 10688 bytes
SHA-256: 79c577c1897f00aba0fe97f910389e668299bb3939d75e10b0ab63140f500408
font_01_sfnt_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 14980 bytes
SHA-256: 03a323294228eaf72878cba7d7d4561b754110ba20d196852938e28dae69fe97

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