Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf5f2e5abb3489d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 08:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 752781eedf4fcf6a99aa9960a51ac65f SHA-1: 33b924da37edb9ceda31eee603eb60d31103595a SHA-256: ccf5f2e5abb3489d531e9dc9e6d9244578afe7cf03ae69e1e27ea335de17b6a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting the guise of a PDF converter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://archism.ru/uplcv?utm_term=pdf+converter+to+doc+online PDF link annotation
    • https://colakcivi.com/userfiles/file/14113732031.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/253339878bda61b63ad057a7902da108/85886157327.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/lafaxinajapilaguputokawik.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/b996ud3kbb13hvcucau8que899/96954863974.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t8si8tr80hd20v6kvv1eu6keh3/soleforemuvuvaxoxer.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/dulurokinerovan.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfe719bfaf---14538874072.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e201b6d6---pojexukufijelolirada.pdfIn PDF document text
    • https://auto826.com/uploads/files/visepateso.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021710433542397.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/73425309976.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gutofozisok.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/48998994259.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/donaladifusejegiwok.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c1459cb5---70453198282.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/26029099225.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/17140521470.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/lakoliw.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/lebidinenozafe.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/72603432271.pdfIn PDF document text
    • http://scsytech.com/upload/files/pofanomubuzabumur.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0b5409c2---kukezowo.pdfIn PDF document text
    • http://www.polni.si/Images/files/levobasazexopanejibe.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/36665894037.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 17196 bytes
SHA-256: 02f9d04fbb046e43891376a11e3a948e9642e2f14a3eafb815917bc3af59f8b0
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 10208 bytes
SHA-256: e9ddaef7bc888df12e7d8701f8d0e399eeeff5d68c5ad6ca4f7328e3b961a216
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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