Malicious PDF — malware analysis report

Static analysis result for SHA-256 977d9eb64a8c155d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 23:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b13f6cb9d0fef98d310b7a31cb282bc SHA-1: 9cc4107fcc5a3c36d1f4ffc4e72b9f7da3fe0806 SHA-256: 977d9eb64a8c155df5a960267b88df3adb3d91bf0dee16631630ef52d3b31093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=how+to+move+data+from+android+after+iphone+setup PDF link annotation
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/99380020860.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1e96e6c6---kofawezepinugepaniza.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lugopileremunufevuvidis.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/mobejo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161335e52bc390---59992309428.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/23560484848.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310da66196c---lagamirefevawe.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/85293491087.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8fe2b358---82415653800.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/botadojena.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/28987249135.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jejuk.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/20955370721.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/01a797a71802201d1fcbf3de350a02bc/18442505298.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/92840749468.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/06/zokodanijabefibalujop.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/gubijuf.pdfIn PDF document text
    • http://hejia-ele.net/upload/nibusej.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/bexixexediselaf.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/ruwunotibano.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/28589486114.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/jadawofepulufuzobuw.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/58670248190.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/pilesubiji.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/lumorososopar.pdfIn PDF document text
    • http://hmed.vn/upload/files/ribibonarilewaso.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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 10960 bytes
SHA-256: 54cdce800d41ddc71af44be089938eebfe6a7133eb936c0abae3aa22c21b0773
font_01_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 17240 bytes
SHA-256: 6f62e8733b025fae3f252a32f6208f3b13aab69df77b8b5da7792dcd5fc1b860
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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