Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe97403f012b469a…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 10:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39a197dfb48d9dea1174a23063c9b8eb SHA-1: 298f6ddf813ec1a49aa8c28101a399401d4c2e4d SHA-256: fe97403f012b469ad5cc1dd42035109df3d3cfca06913e0d88c723bda8c9773a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=open+source+convert+pdf+to+text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98de20522---tutowun.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/co8gdunsftrbgfmcjk193ik7ag/65618851748.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d427338d2cfad4ef3264ebb8b332b7fb/nosepitemoga.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dacb105bd---vaxulonalezop.pdf
    • http://auapp.ch/userfiles/files/fegubonepevovabojupagina.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051072725_46054707.pdf
    • https://machnhaduong.com/images/uploads/files/30089066920.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/55243278327.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246a8e3f16---20721476036.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d40e978742d784cbae8bf634b450ab2a/buwovitapesegimovuzu.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed8f5e93dd---45796073074.pdf
    • http://aire-limpio.com/img/editor/file/27090891314.pdf
    • http://apvn.info/userfiles/file/voluritopuzomefaguwutavo.pdf
    • http://buergerforum-tirol.at/file/namotijodibi.pdf
    • http://uk-finansist.ru/userfiles/file/wiwitidogagazutapogobaxo.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fcbfc12929fe2196f898246509a527e0/nudoni.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80d37e254---59933745188.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zaxizamenugebufanat.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fcd92346a36bab5dc42247c53b815ec0/xelamivegubemadixux.pdf
    • https://ibeguiristain.com/userfiles/files/jokepi.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/vagavetanojefekalurofoka.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3d2c902e---28754805675.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893cd389bd4---13330374745.pdf
    • http://adamlegal.com/userfiles/file/woledebomemapesonumosun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc2c.bin
e52c9c75475cb204ef3294a28e508fcedb9c4af1490167b645bb523a8b2dff28
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 16996 bytes
font_01_sfnt_off00012898.bin
154621b2dced73c37f9d16f54cc0baded41fdbca26d1de702c950fc5e06184bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 10608 bytes
font_02_sfnt_off00014110.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14110 16792 bytes