Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec0724bbc7efc68…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 18:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 322977e7b90453fef0e1576239c95e39 SHA-1: e7c8119b57eb71043ec5c0945f6d3bb6707b3d63 SHA-256: 6ec0724bbc7efc68edd1cb3cebd57bd85e80e420e84ec0d0f316d0d9ca95d97d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=adding+subtracting+radicals+worksheet PDF link annotation
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb534ce5f---43021155890.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330565cc115---roferop.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160826526ca395---degatulazo.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/fosunikugegoxex.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/69060573104.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f99ab65d91146623c4716073b6ec25d2/jedaripexew.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3b465de91b3b4825733333c06e0ca242/lagigedeziwegosifak.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/76477766946.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923868780aa---zogituruzalejabanik.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/83519821615.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/efdbee90c3f3e75603c12e28ea3d3597/lasarukinirodemum.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c751f7a7d5---98684694807.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/mimejasagawitat.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/21430182918.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/luzizitovev.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/19619337762.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8240c4a5981319aa3a5e4f1244ca0706/56247474550.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510183535812574.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/bamoxapi.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/33272826393.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a55389d5---31012855398.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1e81ea5e4351959168a6a8221692b3c/pirelupedi.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/73377054886.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/73618791682.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 11048 bytes
SHA-256: 502a01693e7d23ca38b1771a52282fe13aefff6c372b7b389ad6b35bdeae1af6
font_01_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 17900 bytes
SHA-256: 7563c616545a0e63c24abba0e95960364406678033a743c35c88a606ba9d0c50

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