Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33e81ececc8af3c…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 07:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34587a8525eb19c6c59c717d5f80703a SHA-1: c7b2f3323030af0b304bc0ac3e91f63a922921e0 SHA-256: b33e81ececc8af3c113cf545a832ee478e69150918cab27423a88ba2e8a033fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating it's part of a link farm strategy. The embedded JavaScript likely facilitates the redirection or further payload delivery, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/36e581a578edcb423d4d98eefd8ff09f/94151902388.pdf In PDF document text
    • http://healthywithhart.com/res/file/mesizusuxakumi.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/17105890214.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0b489c4a---12799729037.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/mutebejapu.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/50233563372.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/birapuvepokosopefiv.pdfIn PDF document text
    • https://negaratoto.com/contents//files/zilenemiravusezejabuf.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/ridajulivufetomonuvibema.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/jotisekakixapelibufut.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16107925fc8728---37657029862.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/josowedagizojenib.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fukij.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/36007679545.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/16061726486.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b34e3d0a220cb710d3096526073a58b2/91385802180.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086922e893ac---84405512433.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bofunufimemuralaxupenaku.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/jolewasojovokax.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/99800219450.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/9066478889.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/moveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=meaning+of+prick+slangPDF 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_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 20324 bytes
SHA-256: 15437dd7503b56c383887fadc6d656c8818f96e4610fffce78ee09fa00172acc
font_01_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E66 10644 bytes
SHA-256: 57d3f3669dc61fb128f80498919679dfc12a2dd2440860489d4b2663927529cd

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