Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce29efb4dea5d79b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-23 16:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c511d2d3232898f54442af510f79826 SHA-1: 4f8e97adb259a0973c5f3906e35effe97909d422 SHA-256: ce29efb4dea5d79b6ad57f1fc971ae134703f6e81d85fe7ab89ee1d46af44bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://merlegdoktor.hu/tmp/sibeledovozijovekuwuwir.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b460e5585d---wodovaxu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9hu7rnfou2ejpsj844i6tl3p31/guruz.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131302eb5d36---83537015191.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c271148d5c---vuzoboganisop.pdfIn PDF document text
    • http://premo.at/userfiles/file/nufinopogokazab.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/gevegezux.pdfIn PDF document text
    • http://flirdining.com/uploads/files/49574863966.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/11144701463.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/64467259887.pdfIn PDF document text
    • http://sivam.pl/files/file/xutokanuxuwifubapax.pdfIn PDF document text
    • http://machulski.com/public/file/98074270398.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jekugusewaxajapuvitavovu.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/zawegunosiwomijulodefa.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/97951265531.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/sowonazanovejowa.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/44996769227.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54080188437.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/46455471499.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613784c81b862---zebofalimur.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/nipitoxigezafola.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/93babc33159e4281e109965398f1250f/36291032175.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090821515973499.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/59079489045.pdfIn PDF document text
    • https://landi-bg.com/images/file/38411932308.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lesejovod.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a602d3c48ae79698bb3f156bf166d9f5/lewezuwuniberarabob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=1080p+movies+tamil+downloadPDF 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_off0000b7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 15404 bytes
SHA-256: 0835e00e369043a59eb414d647c2e2bcc2fdc1a4ec331627406f0b90b41754c7
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10892 bytes
SHA-256: d549ec977bbc0f8b62d336eddcfecb7157cded728127299a88b326e137a8b5fe