Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae041f95ed7dd49…

MALICIOUS

PDF

72.4 KB Created: 2021-10-08 09:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f6298c3eda8410c9dfa68ead5726a6d SHA-1: c8db29c3812273e7058648b2062e52237e526b1b SHA-256: bae041f95ed7dd4904a79cb8da25312f4a1e3d5f09158be0e01a666a759020c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=life+skills+education+for+personality+development+pdf PDF link annotation
    • http://jessie.vn/images/ckeditor/files/16840490594.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408cafc3c93---98350150386.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/waxefuparerosoforipije.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/fuvapafijexuxog.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/rinogedabe.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/xipibavokaxovojomug.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7005dfa70ee8066dcd1a914e52ccd4ec/zubepobajulolij.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615741d7715de---23665117989.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/23393328950.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/83096280196.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/fopuxekidizaxazalunot.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/63682652877.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/voxuzar.pdfIn PDF document text
    • https://rinducm1.com/contents/files/49468120883.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fedavumupegonobovamenikaz.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/27250661827.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tanarumiguwuxatuzi.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/83599306903.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/75980311714.pdfIn PDF document text
    • http://exosushi.com/uploads/files/82331038082.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/89970926199.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/libabirotogejime.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/sibenaraxarusokijekibu.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/40900975542.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_off0000b69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69B 11108 bytes
SHA-256: b79713a3635291e325713bbc43aa56a741d9d5282281dc5b13b357a29c599f68
font_01_sfnt_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 16608 bytes
SHA-256: 1db6459f00485a63ad5834de08daec995ccfe6d1240d1a898016fed627da64d9
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1