Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfb3d5bdc2f97a3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 21:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4092610356fcfa87958cbb17d3e5bed9 SHA-1: 8b9c1bd7b431f5a6fae59421e92edcb3f646d1b0 SHA-256: dbfb3d5bdc2f97a3a2f9491b6f2481e05641d6f65c409b28b3a0748d8b54b8a7
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites. Several heuristics indicate that these links are hosted on disposable or compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2926bcd2---tomojagogizo.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/gelimawubusekazase.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc6351a4a---92239893514.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wipufaxoje.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/valolafabuv.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337808ed637---24894862070.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/togedi.pdfIn PDF document text
    • http://gibisch.info/files/files/pogilevafaranulafetewuzu.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/89847086655.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/vijexijezukakasuzogifumix.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090795321_894742895.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/magazumi.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/44653243272.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021926_1778459300.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///sexomokow.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xigiji.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/zumuvusufimireteru.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8f344398---suzivoresox.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/5113512711.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161325da9279aa---63785141587.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/6146464712.pdfIn PDF document text
    • https://fuoriscena.eu/file/bizesawimeri.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/waganatumorazezikunasadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hero+wars+mod+apk+unlimited+emeraldPDF 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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10824 bytes
SHA-256: cc07c27454acac28cfbe45b18ae5b6efcb7c69632b03be6caea585989090c9eb
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 17668 bytes
SHA-256: fbd316f909dd373b195e2e43b8d08fdc6e97a89dc378fcf46035128c1526453d
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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