Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cc4a432890d9e5…

MALICIOUS

PDF

93.2 KB Created: 2021-09-20 06:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0dfa4fe14c225a66e22ec8f29db6ff84 SHA-1: c7ff335dd6fd0bfc25703d81b749d86ac315fe79 SHA-256: 21cc4a432890d9e511c1baa124ad221128a2e703f05ef661258147a6d296ba07
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://bezagsecurity.cz/userfiles/fugikolobi.pdf In PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/73127929192.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/34431739021.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pidumoke.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e8f786709d3470399308a385b143f5b5/19843320406.pdfIn PDF document text
    • https://lesura.net/userfiles/file/33995771510.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kapapixuletemofewitow.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/76154448051.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/95754310594.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/16698147619.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/mofonisujukapipovo.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/68588318911.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/jawiforowireganapusazom.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/89463117618.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/sibaruzuzukodux.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16146d8451f72f---79226774207.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/gonepuziwixele.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/sezuvivogel.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c9ca1cb9dc0dacd692fbfa81cdb04cbf/pirorimesa.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/bisabepotitizuwoliteni.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/bumogojorakikokerakebadil.pdfIn PDF document text
    • https://o-dance.com/upload/files/17426539727.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/58319713689.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/zebimaril.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/dovujitobavijumisulit.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210907_26A711FB80987A70.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+8+ball+pool+free+coinsPDF 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_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 18456 bytes
SHA-256: 4a214dc1b9bb17faee0947a36e6e5a054895b7fdef53d143a8de87bfbf742249
font_01_sfnt_off0001349c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB3 11080 bytes
SHA-256: d9b6f7b77817782c3588596a162aac73b0f1c1c282948ec1d071a1172989881e