Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee2de12f0d7d34e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 14:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4bc3a26fcce790a38342caca5d5ec521 SHA-1: 3c39b52ca4b2754919925ac8e6f8074a14c2aa63 SHA-256: dee2de12f0d7d34ebbf3f35578737a90457c1532a1a8ff2913f920a34a6b6172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The file's structure and embedded links suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8a9de330---36336657269.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/8610538998.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/77984623339.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/totetu.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107312305064529.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e4ce020---napujudibogufuzisokovifu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nqtv793mh6pt772aeo283nj5s1/maxagomumozo.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/refilolejesomo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3972b20a---25948615920.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5fa60607---xetifi.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/lutikadofipi.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fupigojir.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/memubila.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/gaxotelapezufugirex.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nizixafumibot.pdfIn PDF document text
    • https://ivanamihic.com/files/tejorudi.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/wejubi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2a0a58c4---fodut.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/xapiwumasanima.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/1285944354.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/56ccf7f2ce8dac92e7198f553eb57706/55824617462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=obstructive+jaundice+%E0%B8%84%E0%B8%B7%E0%B8%AD+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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 20572 bytes
SHA-256: 578d436e370768ad13d6973bac6239e6d5a68f10493e585f617dbaedfbc1b5a2
font_01_sfnt_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 10908 bytes
SHA-256: e5118cef24d02c1b86cfe222e86d837b28e819479c15ec534c6bdcd19051a1d2
font_02_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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