Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e1c51083b1bdb4…

MALICIOUS

PDF

79.8 KB Created: 2021-08-13 19:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a136933595296639d0bdf42930200e4e SHA-1: fcf5ca5d7ad676f082e1be1842302bf59ffa0d80 SHA-256: 76e1c51083b1bdb4ca0a3cda9857b10caa2a925ddf846df19ddf8183b12d4f3b
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a949f05e---44158529194.pdf In PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/muzijudibajatopakur.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/14099330013.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/73590370892.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad6d76a73---47279299206.pdfIn PDF document text
    • http://gekon.net/userfiles/file/fiziguzawopedidita.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/50140685898.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2314018f33---87027134224.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a140b28069a58d50fb0a2cd1bc2c9169/24154807581.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/pogafigo.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/37660378622.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d255b218---poxejalo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a252cc7640---98037876906.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/783c3409350a298e794b5e9b0f0078f1/wilepixunibopozowirobube.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/peridojasadelemovivufusi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd373997d---dupaduwoj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d3929c2c5---79413472183.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e23a19e75---fapen.pdfIn PDF document text
    • https://eternalbliss.net/file/pasuru.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b611149f5---labavalefomode.pdfIn PDF document text
    • http://jfe.hk/userfiles/kisonodafajejubodo.pdfIn PDF document text
    • http://sparkpro.lv/content/file/54269849922.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074aecc84e2c---82694169211.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/pezizupokoja.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/zogev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=close-up+b1+teacher%27s+book+answers+pdf+unit+12PDF 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_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 11404 bytes
SHA-256: df8e71162d408f173600c0dd54c10c0f5a23c3e1e8f948a6a4cbe4b3a746fa2f
font_01_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 18780 bytes
SHA-256: b916798e88657b70d411d631b146bc84f48f246cc4e860a6ccabfadf51d89b6d

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