Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff2cdc3c60f0cb8…

MALICIOUS

PDF

92.2 KB Created: 2021-08-05 18:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e11921aff4c59ab27ebbc769093f9e8b SHA-1: 4f089398d2ed5020f497c59e850e9c576a45a508 SHA-256: fff2cdc3c60f0cb84e758eb910e68fecb3b06e3b6c048df7fd5c1587a4b2bbff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://daotaonhaccong.com/uploads/userfiles/file/kozotogupibikefuf.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db5e999d2---dasaxepezidawotalerikuwux.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b91c096c7ac7889a86e5ac3d31deeb2d/25029302564.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d1ab6d0019091c6ee26fa93a2dd22836/mijelogofejefixugaxes.pdfIn PDF document text
    • http://yongqingtech.com/d/files/4781328227.pdfIn PDF document text
    • https://wonkingchina.com/d/files/jikilezifepiguvimesebi.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/18290449570.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/85178876373.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/gowileminapujerudofune.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/tipenubujuworowibe.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160def39161965---pudofefovizavuxakexutiguw.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/gedanizovoselexite.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4d5b943b---dekafodonesevopufutuzi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5fdbd88f---pilulipa.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858279f0958---46648373477.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/fofalipixewivorosopu.pdfIn PDF document text
    • http://fygl.net/uploads/file/181502363752.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9e9c0d1cd---24367565839.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b28c11c881---titofagisazididobasizu.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a80da20e0cf4b5ce5bdfb27f8bd1b2d8/42972478188.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/suwoge.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12106298056.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/8141ab5f7682dd55321b9d35ac8041b1/68568183704.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451430134b---bamatofivaf.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/13013473655.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/fepunapugulukezedadaveno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=prudential+center+seating+chart+seton+hall+basketballPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 17260 bytes
SHA-256: 2382dd8706ff5438be6a88cc6c02cdabc3122016624f5e725c20b7a625987919
font_01_sfnt_off0001148c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148C 10980 bytes
SHA-256: 9c1e6cdca402cb45681df1aeb1f53f5bc4c48d7200f68477fcac9c116457e51f
font_02_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D7 18056 bytes
SHA-256: 763091a1cd4dc55378caaeb684490f5b6ac78dd569ce3a399cc8f7baad2277c0

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