Malicious PDF — malware analysis report

Static analysis result for SHA-256 00326a35fd0daa43…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 02:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 92f5fc2bb05adb150754be1ca9d662c4 SHA-1: d3b573661cd9a7531d7f339791f9f3b3f26c3bea SHA-256: 00326a35fd0daa434c9f451549b8cda38bdf942d64cf71a6fb2aecc0617c8bdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The presence of these URLs suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=how+to+design+an+app+for+android+and+ios PDF link annotation
    • http://sunrui-ti.com/d/files/sabuxak.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/65400451064.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/xidegolaso.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pedulesukiwerom.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/37031745566.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/wipexufap.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1f71727c960ae3f490617ccfd736d897/92047137864.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9bc35ff2a79515e3bdaf67d118ba79b4/rasixemirukusixiden.pdfIn PDF document text
    • https://securitydm.com/slicice/file/69122582492.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85597340103.pdfIn PDF document text
    • http://toonesk.com/upload/64023820766.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/peronununalogijeze.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303fdd79b04---nirot.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/53037977029.pdfIn PDF document text
    • http://c-six.it/userfiles/files/11472964697.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/wamamekem.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///86656245697.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d5a07482e2d9e2fe38a18340b45e160a/nivarunalodafenevabom.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rovexegur.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/96801766566.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/nazimuzawejipim.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/peboxaximanimagaloxezejo.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///38416489117.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_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 10704 bytes
SHA-256: 6386f830e1185b383ff18f4cfb93bf0e16be4e40a6ede2a2ae8f6c83bf9181dc
font_02_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 17352 bytes
SHA-256: 1ddd4ccc695d39e03be5174ffc616cb64999f88606f032921af3312b081e7868

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