Malicious PDF — malware analysis report

Static analysis result for SHA-256 761bf01fe0d9cb8b…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 23:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 953e7d23bd4c0b3df65d7fa96fb10e31 SHA-1: 62f5aa11498fdee4b0656cee9d3e904417562cd9 SHA-256: 761bf01fe0d9cb8bad74018df2619eae8d4febbf93f66e2dca510873c55e0688
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=the+meaning+of+profound PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098af576101c---74471116282.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qeei5g78o979t19ja6l5rjvp18/36934062625.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/wijovibagafotivaminalen.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37133085c---tamawirakazeforewezif.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075e26a3aca6---90565195161.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105061514035056.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/wasigufikeji.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f67dvd6ppjhbpsgm7qim6lfer6/81187602314.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531d56fd41---rekojatowur.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105161406.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/najulosegumud.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e40798a6b---29222994224.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/59215094567.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/86226300699.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eecf890175017b3db326a66fdc862fb6/95824387086.pdfIn PDF document text
    • http://crm333.com/documentos/file/xejuxibizamilemapajidaxe.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccf498411---mamavilavoneb.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1c4980b7---xenojo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb634ac4c---liwupitowotizotamewunitil.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19fc7902bc---nabifugefegameki.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210619_370C5A81245A399B.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/xemidarulukux.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607345635ad86---taxat.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/25548477721.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 17780 bytes
SHA-256: 02d17739bbafbdd2a0160bb4f1923d915397283a85cba4fbe882f75112bed217
font_01_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 10696 bytes
SHA-256: 099e31eaee78204111922b422f3b2d1437589de45837263acd1909cf975f9637
font_02_sfnt_off0001377f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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