Malicious PDF — malware analysis report

Static analysis result for SHA-256 593e11f335151fa6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 03:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ebcb5ef48d81101a77b2dea9f1376ee SHA-1: acf4f06e2c4972f380e65b3ac74d4820acd11972 SHA-256: 593e11f335151fa69ef4d5551d5d275414a31c2a44983d26baba259892b86f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://inwebjor.ru/uplcv?utm_term=vba+application+worksheetfunction+index+match PDF link annotation
    • https://markyatirim.com/resimler/files/42416784278.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/49128967260.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/duboxidopetafelug.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/xudipekosadab.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/9162931487.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb15166ad---jebodeboxaku.pdfIn PDF document text
    • https://airbays.com/userfiles/file/67982289439.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/34631723006.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/41066120703.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/datewekuwe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e773df91601---38736217308.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ub888ientclcf5jhuqofoemod3/90177471947.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/34c2c344d05e1eef9575251fa89543cb/xuropo.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/18921868052.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b133fb624a---38574637871.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3ebb9eb95166ed5f7fb8e1d72849d45e/wipikusofalurujeponotoku.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/32539897967.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/zurafetuwor.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d06888da90---dopilukeputuxarulafidog.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/zububufufevezo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161140ccdd8d8f---seberusasorinowofojoneg.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610da3ce9aca7---50008046262.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/owimo.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/4031089159.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/15106305131.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d30cb4ed9---wutusizaso.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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 11372 bytes
SHA-256: 34a16be3ad49e4ba3310b507ee0a1103f2907968aba50fc3ee698c8e34c54564
font_02_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 14592 bytes
SHA-256: 437228ccdee7f4740c28676eb27c732e23f889b9f9b19d4786296669fc0c7620

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