Malicious PDF — malware analysis report

Static analysis result for SHA-256 4338f8cc711cc384…

MALICIOUS

PDF

95.0 KB Created: 2021-09-04 11:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c77783d9fdb46b28735f1f490ead02f SHA-1: 5aa3d48421851b7a41d219cca441efefbd7e006e SHA-256: 4338f8cc711cc3848456e9293d546aedd397698062f93e1ca3238cd5b4972137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several heuristics indicate the PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/442f3056e6fc27391516ca260025e927/83136068682.pdf In PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d14b009dc---53251636290.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/wegekisi.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/vawurazegukuxijamora.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7608732a---50502543438.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ggpb25dvbve7pgsbacpstpnhen/38587448553.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085937902a71---53257012233.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/pekakukasumetowib.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/bivudorap.pdfIn PDF document text
    • http://elitvorota.ru/f/file/podiwiporufuvovotizexavex.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b451687bf04---56580612371.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/piwadunifozovemi.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210810004317.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mupefixituzozofisesedagep.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840b2fa4203---68719433259.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea77e92a8---fizakexafowilox.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/darosojas.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/daxebemuvagudeben.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/75819c2d11ebad70ceca141dc35e3635/30860198254.pdfIn PDF document text
    • http://alkanboya.com/files/file///85395978771.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u84vea96cpgvtr91i7e2mc9bm7/fikutekalitodosamome.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/tekizojojodirerasixesiku.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/24320509709.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/6575406382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=karl+storz+hysteroscope+manualPDF 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_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 18180 bytes
SHA-256: 184d172df6e7f784fd14472f98e067bbeb62581f7fac40d7119b82d984e28891
font_02_sfnt_off000155c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C9 10812 bytes
SHA-256: 363a1422a692ab56872f320fac944394f846ebbc0d6de97fff5cef7475503cff