Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0f26b0836b3270…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 14:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7c735f6ccead7321e02fcfe8224d420 SHA-1: e4bb391de7e69af9f9e0b7dced859db541d0f895 SHA-256: ea0f26b0836b32709244e7e082ab3ca285605d322084fbfd2d74b2b3c85a527d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=download+black+panther+full+movie+in+tamil PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133100e27c01---2921178008.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gatokisiforodo.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/vewamonevibupimivego.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/25096197148.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/88233077302.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/duwogufuwuwotemenep.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/90834263767.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c63d1d128---30560158843.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/929e7ea64a1eb1305bbfedf3c0259517/lewefamamisotagu.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/39397081802.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/48151114137.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/69153509100.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/lipokofa.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/jozofafije.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/nisaxoferar.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905171915.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff3f94fb46---454925145.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/11339927569.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/dogelunodavexumatovona.pdfIn PDF document text
    • http://htygroup.com/upload/files/99675285251.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/8708588410.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd915c8f68---nikazonutomuromokise.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_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 17544 bytes
SHA-256: a88f20d7ee3aa72a07d773b393cd7b81b5dfa6a2e386a85a1a63d43ec9ceab59
font_01_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 11204 bytes
SHA-256: e072b7b4bbbd341e4343a876018ee13ecb46aeef402027cdbdeaee8782e4af55
font_02_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1