Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e9cc8aba17ce2d…

MALICIOUS

PDF

108.8 KB Created: 2021-07-13 23:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 391ffc1ba86b4003597242188c1038ca SHA-1: e10abdf5be44bae3ed2a392c14ad65894ca7243d SHA-256: c4e9cc8aba17ce2d76793fd28bb224d172be4ab216e232d2a016d042e41fe125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://coretry.ru/uplcv?utm_term=analysis+ii+third+edition+terence+tao+pdf PDF link annotation
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f893fd079cc12ec0924a5fa45aab7aee/zamajuxikozunuri.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c1e4adef---vekijeranujatosopogapafus.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fipikawupajo.pdfIn PDF document text
    • http://ligneus.hu/upload/file/depiwimofisudoredamoj.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e925a291791---sogubagabelarepejire.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/84981525505.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizabarajosaxasobajanup.pdfIn PDF document text
    • https://keongracun.org/contents//files/88181711423.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/24595959151.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ef7897ff---walifasen.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a94142b51---silalibol.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/tafepizefi.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/gibojokimigos.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kobujuguwoluk.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/usta4a0j9a11h4k9keb3jhluli/25120251134.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca822e34a---32415984145.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/25052066798.pdfIn PDF document text
    • http://citranco.com/users/files/navoluvixafetojototita.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6h67q8gh3rkf2gsbug0ldt7g5k/dixogilovetoz.pdfIn PDF document text
    • http://15889163.com/ckupload/files/nopabazoregenovonolotasad.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/gulavelus.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/02da41b9e3228962393771e2b5330d3c/logipiwefojolusuwoxab.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/62263742358.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/tazifebixakosuwinen.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/52401745045.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9ec4fd88---gikinefudisurupizixoj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 19792 bytes
SHA-256: 45661dcbf71d8634233ee846ca58c76d665eee9358a25542fb47b7b815a449d2
font_01_sfnt_off000163d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D4 10812 bytes
SHA-256: f63fe72c26f72ddb97a1978faab5dda5465e33bed41e7e51b7cd7b53ea2b55c9
font_02_sfnt_off00017cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000194cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194CC 3856 bytes
SHA-256: 33c6c890e76d16dfeb062c91e6049a2407cdaba269f881d6d956be4d682239d2

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