Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f63b629e1d0abfb…

MALICIOUS

PDF

86.0 KB Created: 2021-07-01 22:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f02b434628a9ced9a20533bbd6ab04fb SHA-1: 1863083ddbcf8e74e3daf9fa4773a82732ab03d5 SHA-256: 4f63b629e1d0abfbceda876a68850524377f296f3a059c8b2e575095d1471fc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=sql+basic+questions+and+answers
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2cec12e794383c393b2c4d5e2a812e88/wuvoz.pdf
    • http://lamdecal.com/Images_upload/files/wuxazidemago.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d1bohn4qion18kl2ro2udov53a/fujowakuzegorovipofoledip.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/em907rlha4p9jjs8h2i7b24s6c/zoxokoxitutu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f0bcdc12b8bf1159f65a81531586a351/16247499237.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0nf82rjs34u6d9k37upgniqhr5/dalefutoxubowuxovanaju.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85c1b6b01---roxivi.pdf
    • https://netpage.info/userfiles/file/92013516422.pdf
    • https://o-dance.com/upload/files/67145858686.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b0251289---18623669399.pdf
    • http://tcihk.com/userfiles/susaravokaronovobojenabeb.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2b81ae23b8366e2571420422042aa68f/80236309669.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o233iaf98mnqggputbu4lmuha6/kivovaforoguwe.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873c3760904---20580110791.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ccsasrc53qjgq1f2unkticufpf/93648561034.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc50b3708f---pepuvufuxoforaxedola.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b99c092d821---11518618323.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3859b0f9---kutomot.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879db4861ea---44717617029.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2sfb9f7942ieeob9btu15htvnv/finit.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4be9b296c9---sijemin.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9e6e72d65f4de5aefe20e60a880b21bb/komugokujofe.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25150650707.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/kh54rsssj5fgfc1tt00i8dj4db/32075246217.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1d33e0f7f8cc9ccd7e720791d57506d5/23083474763.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_off0000ea8f.bin
597b5bf458ff62b863649f718b0b5c0b4dbb4af01c11a815f3602144c6662daa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 17796 bytes
font_01_sfnt_off00011949.bin
f2f8e3345e58c1e43cbd011306572f74478c05441cb0a343a7e6906e6da811a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 10912 bytes
font_02_sfnt_off00013285.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13285 16792 bytes