Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded2ca4a2d0aea2f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-06 23:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d4661183c7183db7d79c14738213dcf SHA-1: 2db307afd17795d9fb6cfb54cf90975f5120cbaf SHA-256: ded2ca4a2d0aea2ff09957eea7b454b578d1a6d5c38172d636a50c320f7ae12f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common technique of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=san+andreas+cheat+codes+pdf+english PDF link annotation
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2b3uj5as9hvbkkgh1rdi1v5pkj/pimidesifudekukekazofori.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf4a4e6e2c---vanifipulupekezobipikep.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05b524431---xeloxabujeloxibenejeve.pdfIn PDF document text
    • http://keitbg.com/images/files/gufufirakazoduk.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116c3f88d83a---bepakorivezuwaxogonu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16112dc0566765---39300236724.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607950bf03e1c---89640897597.pdfIn PDF document text
    • http://sowitech.vn/upload/files/36290698746.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/95542131198.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/derigiturowa.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/daronilijebubim.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/gomidilukexufiduzojirufe.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/pexinetozizojakefivim.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/3808780756.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/75483265827.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/21997223979.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/54908669632.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bc010a8199c415ed217d00ccb11b92fa/sopuxuxivoxukijot.pdfIn PDF document text
    • http://wych123.com/upload/files/luxufogexagefu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/40863878081.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/falozukiroz.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_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 18816 bytes
SHA-256: 3ac640a3b382cfa735bfea797c117cea4ff355119a12ec273f0a9f85beb964d2
font_01_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 10976 bytes
SHA-256: 225f7e9e179fcead27bfd5e752850c6fd71761a072b055a5f972fc5e349775cb
font_02_sfnt_off000143e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1