Malicious PDF — malware analysis report

Static analysis result for SHA-256 be682f21355ed8f8…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 01:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5188f73c25a50cf1ef2757302d41a707 SHA-1: 560c444c60165befb6ab8cbdfa8a25b3a3e32ead SHA-256: be682f21355ed8f83fa97e4fe5c79ba74519ce423ed7d8e2fce2398bd7e5b01e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2096eafde---lepexepexokunapakel.pdf In PDF document text
    • http://kahounova.cz/userfiles/file/daluv.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/gafizekojezajefejemareti.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075b71ce2d54---60557328098.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/40977386290.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/guvutoromatiwo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa70f657eae---jemusowoforemenizovokalut.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0e01d66b---sitegoxupamapele.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/perizanojipesupevexuz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e16f80278---27648866411.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qv78ead7ccfl3ngal66pfaj702/62757526437.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/57378696833.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/sitededosilerirobeni.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/33825936472.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f10025d5---tufufogupivelarudiguki.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/66272539163.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/75805619121.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/tapirunuxu.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/riwajapafatek.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/77727614266.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/68921955836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=preghiera+semplice+frisina+pdfPDF 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_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 10848 bytes
SHA-256: c91be1955e7ef4259c763645c0b363d6714458f1f77eac0420872b1ac9f1441c
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 18912 bytes
SHA-256: 9a1d74574aa73bc85a58b72be3edffd545327083874d2a0a308b4e79a89e134b

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