Malicious PDF — malware analysis report

Static analysis result for SHA-256 778a3e7893519cd4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 10:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03592329faee8d2ab52d99752eb03b71 SHA-1: 7ea472a5cd284aa7166d04279777c2c397c63442 SHA-256: 778a3e7893519cd42fa64ffc84f65af53f20124ce7f4dbd6a3891821e302813e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kuepancong.com/contents//files/robemovoxu.pdf In PDF document text
    • https://cowichanseniors.ca/userfiles/file/99582630367.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904d011d821---68107513485.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/10ej2s0uf20uuvslaku6467397/56308133372.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/ziluxetilidebud.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/46786151599.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588328093c---36481523190.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/4968926219.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/14542600707.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/42348249404.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/21834230077.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/jafatovumo.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/ferudofupa.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eba24cf49---68102338916.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe08c0a59---30900191745.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/77878526634.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/mejudebelatufurovifi.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/mimumudokapanoxepob.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/10736612627.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/30542379304.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/24937290378.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078373239ac1---65278537928.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/7136550915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jurnal+makhluk+hidup+dan+lingkungannya+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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 17196 bytes
SHA-256: ebfdbd57e3a8f3cb805af635b5e17803ec8dc0d3e8bb8ef0841d8a40ad348e16
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 10724 bytes
SHA-256: b7287b28ea3df38fb8031c48d352dda909f03de87c4b534e851312f406d224af

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