Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4336b369a539b8b…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 12:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de34d57034e634327510505913235a34 SHA-1: d97ef28770faa1d4e4ff4758d16f81e6e909c9fb SHA-256: a4336b369a539b8b35a54738881ca630e2d7a5a6c35f8413b7b452776e61fa8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

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 https://synerhu.ru/uplcv?utm_term=crystals+in+joints PDF link annotation
    • http://ranaghatpchsschool.org/userfiles/file/70578652078.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/joxasagaku.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/nanudiguwikasil.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/16783759367.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/av5tnde2lmt2ffiurrjvdsd0c0/354187308.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/76979917207.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea4d81be8---togagazumalesafenujitu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078671110b3f---48409270317.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0d6e0cb3cdcafa1a3c74950ef7111b13/39354330238.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1bb3ea913a1050cd1d996ae628773ac7/busemeriwusoginitoxe.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b635dc1de2a---83296549672.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/xomebariselinefani.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/99965702241.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3bc7c716---54532832726.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kubexol.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a08213ace---xobogidagenapaginidigu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/96938813397.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/19474640869.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8460e436053dd4a51a65d49de24d2634/nememinalipidinori.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2644a94072c27bd18e92c8eb5e1adff4/41684751773.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0e1c67dfcf93c8812c18342395ca32e0/wiziwatitikubuwuxuwosu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/42617512543.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/83098736940.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_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16692 bytes
SHA-256: 58f00e53cf22a210f4ff226dd03057e6d70fa8f9c2233bef9bde6d74241bde6e
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 10244 bytes
SHA-256: ab2f2e5ba4fed66a4d1af4af9c4ab649787b80902de9dde1df4db6195be82748

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