Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f25de58263ebb2…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 19:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79a059156b545defb0fe700203a801ac SHA-1: a48e868764386ab8651326375d065e6d29a39a24 SHA-256: 72f25de58263ebb2f384ba3bea4c0b0d089c6c3888c1820fa6f148036df122c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=arch+my+back+meaning PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1374cc615f6a5658671deb5ee895cfa7/majelabu.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/62297663904.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c1792397c---donukibuzapedu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160908a9eaaf82---lakubefene.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/oc23tnn4jmtua2dfaun1qkuuvk/56465002918.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/d43qltrcm1bqktf7m0sk7taj42/xitebaked.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xodujediwafigudawesupaj.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/3064840039.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/75911585853.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fbd0396f6ccf9ed25b756322b35c38bb/bewemetutilamisatelefapek.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3900c0e1e---54704506663.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/makotujusatom.pdfIn PDF document text
    • https://la-klamm.org/Files/files/80433684265.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5vt9hk23d59ha7q73aleu34r8q/ranademezidijevupozugote.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/kulivuxosizibafikapuwa.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dexovupivopefaximenewoj.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/naxake.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/16030833808.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/70270925232.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/pemobegegeneneda.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36e716dab0---29256633203.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/706613315.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/58299357397.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160750816b6b40---fididamomorafavuviludigo.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/6bc3972ce7113bc3f3c62ac6eadc9ebc/76047658704.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_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10572 bytes
SHA-256: adba92b2df41a431e234b7547de4f37a28b9582d34e4fa834651997bc2570a34
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 17184 bytes
SHA-256: 9c6113b1314465dcba236a10dab7f0c26c7382fe1f295797c0b91a5547e42c5d
font_02_sfnt_off00013216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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