Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2b08e1d5775104…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 15:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 907f3b065be6c4f17c422906a45ce4b8 SHA-1: 0ee038b8141446995b277665ca698c7e88a469ac SHA-256: ef2b08e1d57751048d902ef709c768f30cb166b0a9982ba01cb1767f09f172b4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains, suggesting an intent to distribute or redirect to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5df8860294330325475f0c4eccfe7443/wenadovixotiwimivino.pdf In PDF document text
    • http://karlsbach.de/userfiles/files/94150901991.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/93779382231.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/bogixujeguluwuwofebi.pdfIn PDF document text
    • http://protok.pro/upload/files/nobubuwekokan.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/warupodajiw.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/8421047852.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04b2c2b54---nugewejed.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210910234913.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/managatijukesuxiwisuburuk.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/99122511836.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1ec5a6da---talati.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/8353515934.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/68277514433.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48d8d24cf---73760918368.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/79108361315.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf037a3d6---10731666735.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/67047078306.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/galovibadosop.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/bokudopefovonunezivu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hnv9hhai8468lbjg8j1nhmtchn/95790456023.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/nijiletaxir.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/13725004633.pdfIn PDF document text
    • http://demkapi.com/resimler/files/sawofekewopugam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+city+tool+session+idPDF 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_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 10660 bytes
SHA-256: 95b4f361dc0fe5ff82d02a1de6592b8f77a5e14df135a5e85a53ef271642981b
font_01_sfnt_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 18040 bytes
SHA-256: a007ebcd7601bb1bde38fda5aec58143edb5368cfccaf47ef0595b4bfb8d71ed

Open this report in the interactive analyzer, or submit your own file for analysis.