Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00e16565d5e0c58…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 19:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9103ed0b1573799223bc163de97a921 SHA-1: e0726d15bc57a1b354c9a36ec37bd79f20676d0c SHA-256: c00e16565d5e0c58fe313f292ef1a4fd10eed78d7543ab2191494bb26de4f689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://eobliecky.sk/userfiles/file/5555534911.pdf In PDF document text
    • https://e-ceramika.pl/userfiles/file/10824944565.pdfIn PDF document text
    • http://jaqalsports.com/files/file/xudov.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/17784861339.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/91552049231.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/fatimegukedovonexowaras.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/27735654891.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/87362415905.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/2962479911.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd4757784---wapafidozelam.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/buzemiboporijavebopomugag.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xijigupabilidozogixumipaw.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2c11cf7433d6c33168043d8bd3d911a8/12254669154.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/64616579832.pdfIn PDF document text
    • http://honda-vo.com/upload/file/7725157000.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/79362473677.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374a8d639e6---71962942882.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/63010507317.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/ralizefexiwozobesunufi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/wotamejonigugorewilazu.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/97091452317.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/mibimulonenoxulatapovudi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b204733d4---92265264189.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/98667862996.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/1121399369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=67+unblocked+gamesPDF 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_off0000b5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 10876 bytes
SHA-256: 7d1a3e4c41279cdc78b95da36dee287c3a0dab6fbffa4233f391418dbc1807f6
font_02_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 15676 bytes
SHA-256: 861a6e0b1252e1e21539df5e255b8f8fcfee35496224412ddb950ec28b290181