Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0f9bf6dcc93c52…

MALICIOUS

PDF

75.0 KB Created: 2021-09-11 01:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 50a0f0a497fe83bc3f84cff0037453e4 SHA-1: 936115a9577646957b23ae118d7969fd79f3c948 SHA-256: 5b0f9bf6dcc93c522653683b082f6c4fefac7e8fa6bdcb3a6bedc1a8ccbbc0a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=gotta+kick+it+up+online PDF link annotation
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b3a52fc44009d0512a53e24373c126ab/potejig.pdfIn PDF document text
    • https://somogyplusz.hu/files/48637219067.pdfIn PDF document text
    • https://masihpt1.com/contents/files/guxufonigefaxinu.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/98310896542.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/32122809615.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/lijupixenakoragud.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137590b01d26---26610034033.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/84394763567.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/52132368917.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/13287653195.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/geporupulenuvus.pdfIn PDF document text
    • https://dafelia.com/files/35779299617.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/xiganekos.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/32014315131.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/xosozijubojepokiguru.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/20834721792.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/zexuwe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307ba2f15a8---zituzesuredem.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/44744596946.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/71743589103.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/ronoli.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/33198426611.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/nanepi.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wuvuvarogaxafobowaz.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5600i68jf4t4rdesj071hed03g/zegipenuwux.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_off0000c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 17508 bytes
SHA-256: 436512655171af2e92749f9bb3ace1b26ae8379193fd58decbb7cc25a6a02369
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 10332 bytes
SHA-256: fd41c335ce129f6b0c116f6f6d2a6767dc449e54d56a9f700a20aa34d52ccfab

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