Malicious PDF — malware analysis report

Static analysis result for SHA-256 f558e0e64142ab78…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 00:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bdef4336eeb1bfeddf146bf934aba394 SHA-1: cda0b5f145901f59ec44edc3a59755794a4b8998 SHA-256: f558e0e64142ab7879880b651e423a7836c26d967b6c2f48d490919a794ab175
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, likely intended to redirect users to malicious sites for phishing or malware delivery. The presence of multiple links on potentially compromised or disposable hosting indicates a deliberate effort to obscure the final payload destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78964ce1b---xixaberavigagusifowo.pdf In PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/74989579476.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/98215938590.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/66cf6f8fc3e72bcf1b752bd7b62e8258/zikaxirexatuvud.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c7b36539e3454ed2cf779f9dbd787459/levexadizagaxodugesabudit.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wavuseferemekijuto.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/170e99f259fc23a30d3c7f0c326c57a1/datasipulifenelame.pdfIn PDF document text
    • http://distributoram.com/files/file/18453271119.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/lasusagozuzazutelojitumop.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d27e5b36b---53630269021.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/mibat.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dajusuxulotof.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3qnd1jg58g2covn5pnjpdtls61/luraxeli.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/pisidosonogutufoz.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/19787673814.pdfIn PDF document text
    • https://123natura.com/stockages/files/85798102798.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d660fe79600---wosibujenitotofuzalabevu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9n1h0hkr97a72traim4sblkc4v/mogugolini.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/jinukogukuwugazivigisujud.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/kibopezirenew.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/475rj28e5f1gup0dool10i10g8/doguzunadotewapamurazagod.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107241920541318.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/luzotajuvorudag.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fe8f5424ede0f67e5b2afbff6c3fa279/genexipa.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612119c852486---topexebojix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=final+de+carrera+schneider+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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 10476 bytes
SHA-256: 5f4d7746b48e540e63a3da689d733ec5f45c67198e49bdbc19ffea12e4a8ff91
font_01_sfnt_off0000ebd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 20040 bytes
SHA-256: 5fbc57649148cf09b46f47440b33f8b0518afc544bb92abd1d39ab08b160ebee