Malicious PDF — malware analysis report

Static analysis result for SHA-256 62369151a43489b8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 12:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6c6b2a70323b8527cdb40570eb1d24ae SHA-1: 37ac7ff4dd8af77069aa06a094e9ce189c1bca04 SHA-256: 62369151a43489b8faa178be5a2539108a6e68e47ca53b51f5fb03f65d1d8dcb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7912bd55b39d87de1b2d37615297bd12/wukazej.pdf In PDF document text
    • https://studyhalltracker.com/files/file/loxunivawemo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350d4a98c63---tuvumojonojaxetiju.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/kunuluwi.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/21625173086.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55da1d0f1---63092881448.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/nudiba.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/28308139137.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/11140036698.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109102006395780.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140551f80c7d---91623382716.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jopadifateturadejuxivi.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/sutafogibavotopexud.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/tujurovazataboditefajel.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/bazazegulovaxatovopezavu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jorike.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/67416539583.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e93e2c1f7---kuzuxakefujinotigaxan.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/98945460938.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140638dae7bb---2556662380.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/pidovijifuboroxudefoposen.pdfIn PDF document text
    • https://renault-service.com/userfiles/35976585731.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/tipilabuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+kotor+androidPDF 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_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 21228 bytes
SHA-256: 5179e522bac286aa509455f6ed9500992bf59cb757929692914d324cad40822b
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 10120 bytes
SHA-256: 336753af87a93369165e6797a334d9ae94f9824f223062ec479394750927a24f

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