Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcb795390d41bd4…

MALICIOUS

PDF

90.6 KB Created: 2021-08-10 23:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81025abd39b4fc97dc608c19ad67590e SHA-1: 5e2fda19cec9c6d81dc4c95d0bcbe2b040fa70cb SHA-256: 2fcb795390d41bd48c51a33ab85c6170c346550128a3717a706e3ed6883b6864
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. Heuristics reveal it functions as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/920f4fa50f7dade1b948f292da2dac99/98112335171.pdf In PDF document text
    • https://aedwea.com/upload/foto/xuwuvizojukam.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/nodaxilazarojogeges.pdfIn PDF document text
    • http://martonelektro.hu/files/file/25793892989.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/rawujajez.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/58239170467.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1061577135---73748545008.pdfIn PDF document text
    • https://seerupit.dk/assens/file/letaniwigetiwafevij.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7e0876136ac7b553661ebc13e7766b7f/jazavivub.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/kodiferife.pdfIn PDF document text
    • https://wrd13.com/force/file/sesedawojonokovew.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f836d5d675---patulegu.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9a222900f5850ae7e6b4d1006f564acf/peboxadekebejenafapagov.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859dc6a0598---gepesofawete.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/18630225630.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/72332006789.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728965a7e86---wekaba.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3831e82d77---32312745131.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/59db41018d39b3f3f7717e05fa0a0c24/94348191985.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b20cd475---51508171912.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/2522328216.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a3bd7cb20c634b9a6bb6a5f9fb30e516/lixak.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gumenemirugewurebamopur.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tevadoge.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9294973e6d---tobutovi.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/gazinunedorisatebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+take+care+after+botoxPDF 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_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 10332 bytes
SHA-256: 574abb27d47694e212f7b77d142b05dc659625074ce4d2cfb1a3b8b47f134418
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 17192 bytes
SHA-256: 566bccd0d1ea38149fe870492fda3c73f7ace67c94f52bf3c30be331fb3fa7c7

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