Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9f759b6db700c4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 22:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6863263ded93dadb2afad9ff81acc5b5 SHA-1: d8d6aed87833b4b64800a4a2d8a2411f35833b6b SHA-256: 6c9f759b6db700c4b0cccfaef2553068031a5afffe2e1318fb939651c3ce8156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sanphamhanquocymy.com/uploads/files/54454051793.pdf In PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/44364af232df66a759911820c658ea6d/6042872668.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ef1da9a88a19122e476740e61c4a0674/20393190381.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/25303671530.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084d24301e8c---99614936637.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6295871ohqrh9a2vmgo47p4gc/38683072231.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3a0413121dd51e8c2b0703e18fb0259c/5401908472.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/18367023603.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/14931322922.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1635b0fbea22551dba3436ef3f81e2be/venarojusenerasobedufivi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff86fdb607---tosikudori.pdfIn PDF document text
    • http://alkanboya.com/files/file///93505525381.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/musima.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/2006601229.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133220689f---tigosuzanejamabibiwi.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/rufalesevixonogozarotado.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/79483064856.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/52675124032.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4d7vsf0pd70n6n4fbo0g9pjp12/41381540945.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9cfba9a0---fugatirevumetivinavi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/37533691198.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5017613e---ruxewarupegabekozajipo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/roluzigariwefowomigar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=aldous+huxley+pdf+espa%C3%B1olPDF 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_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 10704 bytes
SHA-256: 9b7a1b6d1cdaf7b7cb39c1db151a9ebd5168bee742fda190f32fd510b032627a
font_01_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 17532 bytes
SHA-256: cbbf9d4958e8ce22155f467dd2c831b033dc7782eebae52a7caa932423c136d5
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1