Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef36b4d28e25130…

MALICIOUS

PDF

79.4 KB Created: 2021-06-30 12:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 525abdc331619a67f3430e04854f3285 SHA-1: 52d8b570b82526672d5afa2a95494e42addf4d8b SHA-256: 7ef36b4d28e25130c687d1b4fa4a3a08f089e0c9ab064933fc90430b50c1adab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting multiple URLs that likely lead to the download of a secondary payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0acf0f9e---zujolu.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fc4a2b45b132523b9f727c4ef71fd069/20190106335.pdf
    • http://aarogyamedico.com/userfiles/file/wifusorowix.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a6c561da---sezomikidanetatevimem.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f7b2439ff86ae9c288aea9db405d132c/suxadalikadubofuvon.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/uit38k8jbou8mptlkl57esvqc5/79567212857.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c053a528d---duzovusasujizexudopexakek.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/bukilumedozaweruve.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/vevuzasaj.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/4420ec7642f6c595c420418aac61c2cf/18399228098.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fb47a6f8e96ff3b4c2eb3d6c5fb19712/sokiravavavedumopajil.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f1d8c8a6---53389715214.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eeb638a6ad22192ba73d9bfd54e3b353/jaxukexopuxesuwitenubag.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-20/20210620220459203108.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/da11d7632eb0a2d506fe1465ed6291b0/97402303325.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160771139b86dd---8300007092.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3a1b75c1---supegipasaganimewiraregi.pdf
    • http://ahxxzx.com/userfiles/202104/file/losajaxikafowi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee69d477c4---bakosuzavezoguzipateved.pdf
    • http://vencedor.coop/images/admin/file/gapafumiratejugidel.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0lt8uoobv0991eul1e61fm1d7i/jabumewuwe.pdf
    • http://roycraft.ca/userfiles/file/suzowajejun.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16a5f07fd---vokaresiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=is+875+part+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d407.bin
86d794044a940297931b33b28354e9c329763adf7956dc35c7823fbf8f3ae9d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 10268 bytes
font_01_sfnt_off0000eb56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 16792 bytes
font_02_sfnt_off00010368.bin
72f7341aea8059dc21bef561a2eb998909aa4a8eba4ca30d38454bd2a30020d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 17244 bytes