Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c692e8632216dcc…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 07:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fe7a90b1755d9f8deef9ff0e08e9d49 SHA-1: f18db6ee1a0804f8b5e665133cebca6e19a3be00 SHA-256: 8c692e8632216dcc5600e7f135f7f90f6ead109c4b4b62454a06510fed93cb90
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of multiple distinct hosts and UTM parameters points towards a coordinated effort to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=bulk+reef+supply+rodi+manual PDF link annotation
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f0d89866---gimatazoguwezubizufizana.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc327079c---mivewodalu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/11486d567811de843bd3c246e7036178/75086245277.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/rasopufi.pdfIn PDF document text
    • https://advik.net/userfiles/file/40450219936.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/a630f7c9ec518c049d04325c7503cd0d/kagajukesik.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12e297ada---zuvugatujo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c86db57e145b27c10d3c3cabef0dcb2a/fokiwokanenulejudupiwowal.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/739ce4b75b685463306193e3f81fe047/78413661210.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/tazasanezenagutogo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aae2764f93---8101388792.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bojomumisa.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qg1iatsbsdrnjkbltgjqcqbgoj/77553040508.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/34844330947.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/m0bs5got9fo88e7la5uagkt2h8/bavuselilavo.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/tetipigebatalupolovotava.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nofudufuwudowen.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121cda3721c0---36187980813.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/83677151961.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/buroluvigudosudoju.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/73783151513.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/79012135894.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/95900205281.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/dezuxekebopadop.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/jezixuzomomaliz.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_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 10920 bytes
SHA-256: bbb71f5658ac6432b08e7a5940a6af5d79d21066e6b76b91a23160f939e7434d
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 18660 bytes
SHA-256: 2411c5ce94d0a63623637befa88900745c483cf0d982a8ddc735788dd047617d

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