Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dcc2ca5e638981…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 18:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3e48d3b9d5ec2615f60d288c5eb3fd6d SHA-1: 550cb5f673d497731b1ab01b3abc4ab9146aec9f SHA-256: e8dcc2ca5e6389816704f94f6fccedb993f5e0b5147403c5f4101710c6e719e3
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social-engineering lure to prompt the user to install a browser extension or update. This is a common tactic for credential harvesting or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, and numerous URLs point to potentially compromised or disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://sanxuattrucauthangkinh.com/Images_upload/files/28646296017.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2e523699076855dee1f8d4a07c21f484/7882708000.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d141baa1bd---13491057618.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c88c567dc5e---bilim.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/jumuwobiweledo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vekile.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c594edaffa---pobosafafodemoxitisuvu.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///suwanenovuxopesidez.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf52f764e5---33942884537.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4009b470c---88080298365.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d139fe6d3408904e00b2d4a2c8c074d2/38612713859.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/518f4dd1f451f3078f6bc2a447dddfe7/voxuwejivapawopudowekit.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/tqro35qghfkatclvqjo272vek4/mebokavuxojekamofabixifit.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9b59d748f6bdf3c7373cfe3fd204e1d5/84977243522.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/42912645975.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6265e296---jigigunotebiz.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tga1jao7u0qav6rhn90e0rp6pt/53713281198.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2gi02llufm2sb4csbel8i4u7j2/65982208224.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/venilopeso.pdfIn PDF document text
    • https://invest.pl/userfiles/file/45316255173.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/heekeqg7uipq1ksu3kmd9b9000/migakivibetijut.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210626032336.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/vepepemesamijusoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+master+chrome+extensionPDF 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_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17216 bytes
SHA-256: 3247cf85f2cfbb0b00512a6faebad9872f6b7eb5c015001f398a3474c8950711
font_01_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 10824 bytes
SHA-256: 3f3fca35fd7a40ef5d06eab5a3cbaac57356c141ecbd997ac0965261b428192a

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