Malicious PDF — malware analysis report

Static analysis result for SHA-256 5011f8f4aaedf6ce…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 12:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c661de44c34dc81f664db1258b7ef0cf SHA-1: c080ff3ead4425f6e34aa43b8628ca0ac9014268 SHA-256: 5011f8f4aaedf6cea8d89249bf153e38c53ea824bc7195a9d18c7f14cf842d0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=download+bootstrap+4+documentation+pdf PDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/788b1bf70a24c0ef2eb3c5f2b1dd7691/pefidonem.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/fe8b0ba4680259a7220b77dd42a8a611/66173518393.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6958cac5a4---63309916958.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/kuvuvanixanazokeg.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/xononafibof.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/povudubozog.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/3655312416.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/88848738427.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/datogeve.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210604162718.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3e1a0cbff1ed2c4401f48ccbb108bc97/65697976385.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/zederosomakurivedero.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/abc63447bc96253514ae01ae5ea75b53/453624067.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1cf0adfb654c51768ab660af58eab63f/mutuson.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/273711fa4282e9e48ec38ad117af53b4/tazijubibana.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/3064510205.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/kurukevogabuwuwedojeno.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc7cddc410---54162788893.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f3a7d6bc---23620638376.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d5fbf6e6---17097847780.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711b1da373c---gakawo.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/gulomiripizigukebi.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/18690782521.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_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 11184 bytes
SHA-256: d3ddc292f2a5768826a9135cbe9095a39b648bbf86da8db6290fcabe68b9cf89
font_01_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 18236 bytes
SHA-256: d42539183d4e9379be26cb113a016d9d76ab0887f698130c5db55dc6b21b53b4
font_02_sfnt_off000142fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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