Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd904435166103bb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 00:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77cb4927e78729cea357c0ce89b5b270 SHA-1: 156268822dd5a6fb55dddd79e76c66ba2a0f975d SHA-256: cd904435166103bb357079ec5ce37bd568c3848b14c1af3e93f80d67ee7e9a89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious payloads. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/26miiupdq2d6vtb8hf8n9noitj/fulotawesag.pdf In PDF document text
    • http://birdwatching.sk/media/file/bimosuvabugopuvumaxa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/55d9d1fbabb885c112303c98a030bdbb/zagolupol.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f5ba3300---51977719612.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/xugarewebejaxijesijis.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/1440140454.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141009f4580e---88666898156.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141150265a58---vefosotesemepumabapolijaw.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/rujolanedezakuviribasel.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/46009002354.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbef08df4e---wusekifijix.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/kadozexam.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/37434184826.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/7789444395.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/95374386038.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/rovifopomek.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/dowokufaduk.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b68dcfc2d---bolodekizozefeku.pdfIn PDF document text
    • http://toonesk.com/upload/66132250330.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd106c87b---96355991010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ml+plus+injector+apkPDF 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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 17620 bytes
SHA-256: fc3b4f3eb27e8e5eb475c221ccafedeefdc65d3c55c8d66932171da33a4a9a05
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 10680 bytes
SHA-256: c50104cf6484e127380bd07548da934ae1eb2cb63bd37e9621a8e930c1931a32
font_02_sfnt_off0001268f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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