Malicious PDF — malware analysis report

Static analysis result for SHA-256 1252f2b0b7dd7c93…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 10:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63982637b0781edd34db4ef2a3c0cac2 SHA-1: 32ef4de9ec0931e253d1bfac9b395711db4fad11 SHA-256: 1252f2b0b7dd7c93679061b0edf9bc833d8691a850a9a3be34fafc5ca2d7924b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs pointing to various websites. The presence of multiple external URIs and link farm heuristics suggests a malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://garglob.ru/uplcv?utm_term=mercator+plotting+sheet+pdf PDF link annotation
    • http://www.petercar0937494634.com/upload/img/files/59460309060.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/24425813555.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/81275701828.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/1435760601.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/48753203741.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/xidinasavonotuwetek.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/17151601747.pdfIn PDF document text
    • https://emmaushuis.org/pages/96895642595.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962eb8d3e1f---30778341786.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/21044890186.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2546ad544---47286241298.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/musexipugo.pdfIn PDF document text
    • http://nincity.de/inline/file/mujowesewesutuburifujemu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/724de59c09e1a65bc52b5af084044839/62800571545.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161287e40a4e7d---kefuzanelo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2baf95871---25536416067.pdfIn PDF document text
    • https://5uempat.com/contents//files/xidatal.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/mudowumumefowewajazanadov.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2f22a8dc---27457069103.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/51474079798.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/94715691849.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/tuvafawomimizoxuv.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/37269279590.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_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 16988 bytes
SHA-256: 9b0b4c0647a69788b4a313938be7ee31bb964dbf68f7ecfb3969d5cf819036db
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 10892 bytes
SHA-256: 2d1c15531b8c7a30734e47b1fd209c8614fcef2b3850b167dc82a1a073f22fca
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1