Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9869aa02a75da4e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 14:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06fd0458f4fe88481d2a98905bd1003e SHA-1: d5a2c57ba894811bc85c1e78fd72dabbf89d4250 SHA-256: f9869aa02a75da4ead8ad76d800914e2060d5e5ee641f08a1bc40500407a540d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://synerhu.ru/uplcv?utm_term=vice+city+game+download+for+windows+7+32+bit
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fibumisop.pdf
    • http://mamitobe.ru/files/file/rilatutofulu.pdf
    • http://honeystraw.com/uploadfiles/file/58840366230.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/80844406185.pdf
    • https://ikansambel.com/contents/files/lanikoxotugaxikigimusi.pdf
    • http://gaudi.tw/upload/files/55042841932.pdf
    • http://karpatskiles.ru/store/file/gagalisuzuzivo.pdf
    • https://livermore.com/wysiwygfiles/file/40729604386.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340badca8e7---10593881321.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/tezewegegopobuwibo.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/12527623721.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/47698963873.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/66598104097.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2916398e6232d53b69ba4b49a926ea7e/gogereri.pdf
    • http://hrudolf.com/userfiles/nonijul.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/51458429243.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/suremejajoteganar.pdf
    • https://kovtec.pl/eurostyl/photos/file/vuzimekow.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2acbaf2e43e0091fa01361d74aa4264f/2018854168.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/93119358222.pdf
    • http://goref.ru/files/file/2351186741.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335430ab5e4---lekaduwugunotipovotefuj.pdf
    • http://studioesflores.pl/obrazy/file/16744396766.pdf
    • https://planet-pvc.com/upload/files/85555926095.pdf
    • http://kapsalonindex.nl/images/uploads/zexobamekul.pdf
    • https://wsbtitan.com/images/file/1118108251.pdf
    • http://grafichesirio.com/userfiles/files/sefofeloritifuvo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16792 bytes
font_01_sfnt_off0000fe27.bin
26cab86e900a0fe76ee52cfcdd6ff7f7c53b609a2b8435024228fe168249f8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 18120 bytes
font_02_sfnt_off00012cae.bin
7e71f09a834d9951b0958cd61109935dc9164217fbbcf6c2c24f63d0b8abe2f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 11468 bytes