Malicious PDF — malware analysis report

Static analysis result for SHA-256 10307da8550193fc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 10:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 506c943cb4a0388d22a9e1d3daf721dd SHA-1: d15a75df6f8ec5bc07d8b8d58b4c0b3d5505c935 SHA-256: 10307da8550193fc2a2615924426380dd1785b2d478c1b69edb9396ff0a17980
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chanakol.com/ckfinder/userfiles/files/77597441330.pdf In PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/81318029980.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/liledazipajenenarawexok.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/91675069425.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/80242235593.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/gapev.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/topuxixavar.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67854bd0501a9ce6f51bfbc4a299591b/bamejinutuguzijezevirelag.pdfIn PDF document text
    • https://eklyps.net/images/file/47205982492.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/32845781042.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tk78lbll01fgl30fbpoo81c8u3/rogegozibaziparajixup.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/92879530724.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/raboviviloteposekomevu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/56076085805.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/2997359932.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/jeduzorodozabopej.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/61062319297.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396233c9b20---jafafifeguzapipelusodigob.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/43034750065.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/42130081176.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/budebov.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/fijezotawon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=love+island+usa+season+1+gomoviesPDF 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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 16120 bytes
SHA-256: def0b74acd42d2c2cbf29b5a7a231a7b2fdbbb9d580161720b6ad8977457d105
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 10568 bytes
SHA-256: b66ada06d0707929960b404df7338065c8f42c318d4e9dc0fff734407a06325f
font_02_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1