Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf76e4def5d27b7…

MALICIOUS

PDF

79.4 KB Created: 2021-08-26 19:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b0a8097ccf278dee9f52941cde023f01 SHA-1: 8deb49ec281f11da14f7aca0d7c7217bbb81c54b SHA-256: adf76e4def5d27b7e6173b6a6c2225d582b885c6abfb70c58ed8ffeae79d592b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of numerous links on disposable hosting and compromised CMS platforms suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.cafeinca.com/img/public/contenido/file/duranowuratewanokisojowal.pdf In PDF document text
    • https://privatecambodiatour.com/userfiles/file/85326717927.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/21cd77a213cdb9ef9fffb09360af55f7/tibixakinadujag.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da2991ace9b---dajumibuvawexovijotifuta.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2d0adfa2---vajok.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/912ffded9c9ea8b29680982de73d59ef/25198660146.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/14485435828.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf311e4f5---gejakusenederoso.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c1e1224c---vukazogadokuxoxugaf.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f73f989451525979d095e1a4a622faa4/jilutikijoji.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0e5aee6ab10f1c0fbf6d7f4ff426e797/540676388.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fad00f5ae---detubo.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/40460652702.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/71104398339.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/wibevutu.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0aef1c0ee---24759063869.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741bd221b5a---98948836887.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/waxugofobasobibufivivim.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/63051798380.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/47870067108.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/badinedasefatebidoxanagug.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/refuwivu.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/25590892976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=triangle+congruence+practice+answersPDF link annotation
    • 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_off0000d553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 16016 bytes
SHA-256: 8b6f2aab13232635ed11531025879d36eea66c7128f5506bdffaaeb2fa7e9c6d
font_01_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10696 bytes
SHA-256: 751d8cdea02586cc339a86d08617e06bb715f70e5543cdbecf9844b8f0957824
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1