Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0cb5d2e6153d77…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 11:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 85389dc7831cb9d8f313becadbce8aa0 SHA-1: bfed56c50ac9c6d1fbd9bc6c43635100b23d417f SHA-256: ad0cb5d2e6153d771923febb204672c8b450a5153c2f9e8cf53e605e009ca042
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites. Several of these links lead to compromised CMS upload storage, indicating a potential phishing or malware distribution scheme. The file's structure and content suggest it is designed to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://awkontrakt.pl/ckfinder/userfiles/files/18174099653.pdf In PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/vabipa.pdfIn PDF document text
    • https://datenglagi.com/contents/files/mirirepimitamaw.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/69270727487.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cecd07ca8---kakugakifuvavikusezuno.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06c4dcb74---fuxigazatomelusobinojor.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145652d280c4---guselanuzuladudo.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/gisupenuxumusapazojol.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/34110747872.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexibobitukurizubumodag.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/67709250327.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/kidamugazonevolibimer.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kuvuvotuzazot.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/nusuvoseziwo.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/xonopivimorijijeve.pdfIn PDF document text
    • http://npas.ru/pic/file/tegepawijodika.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fcf0184e7---rijojokupipuwaxigafi.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99500657781.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3c63ed5599aae13f1f9b4bc4197835c3/laxowikoju.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/jezexizemawukuwusuzemojuj.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/70400513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cool+s+copy+and+pastePDF 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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 17256 bytes
SHA-256: 0feed5866173efc15660d34d8bee170467063d6e0448b11ddbf73b57046eef77
font_01_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 10460 bytes
SHA-256: d77841498d415bf116926446894e6e72d029487adf5bf9f833dd52a0b53396df