Malicious PDF — malware analysis report

Static analysis result for SHA-256 37463ea3cdad901d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-22 07:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 317a1cb7ca0c9c45ca9073f1785c4752 SHA-1: ba61299f2a2aeec00d83c1032d1f1f9408000fda SHA-256: 37463ea3cdad901deadb450024428df7d29451ea1984628f75e60f7a1c02e1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://wefocusdesign.com/upload/files/fanigof.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1bf1225ddf87787fedf473b78bc3296e/fekevosixorowumenu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079148a6cebb---21242316597.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/90962afde546e08ac76ba71c83505706/85908293962.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7ce9867a4---853704683.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pijebilimalukexopi.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/68222955678.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e30c45f383f45cebb7f25aa64dcf4e05/gomuvaw.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/xitewemixatikotodozuro.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfba8aa58a---59450480239.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a002daea6c9---pagijoxisojunaziri.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/zimamub.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/70b91b1b4f21e56916c86c12047d12d0/xozutavavifonatezokipen.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/supaxobunoxokaxaboli.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4abee93d---tavelazijomusas.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/nidadapemeru.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/15508823471.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/j7oelittfbn5jv2qtf4jokbcue/44060771773.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d590fc3884---gadivo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d61494cc10---pegizosawabakofabebar.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/pc97d9kbulcs3dim4l01pckr4m/kufigelojefeterolegege.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507123334_867341822.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/jejikikapewiganux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pro+comp+ignition+instructionsPDF 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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 10480 bytes
SHA-256: f4dab09653dab4faf54bfc2b890d0bbee4501a6cccf2a24f0e8255a30b58a311
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 17544 bytes
SHA-256: 715d0625ae6fcb865b552630dcee9c9b7d13ba52eb54fe0b01f8bfaf20bf5449
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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