Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eea76e222cf7091…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 03:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b380c2ce03fd21f5dd8a17d0fb4db32b SHA-1: 9561fcf7c4f62dee58abd5297843da86221af158 SHA-256: 5eea76e222cf70913a262068749630cd2b7baa0021bc4927a36d61b9a4076981
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and other domains, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The structure suggests it's designed to lure users to external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/35236472ba2bdaff4539ae44b0e5a822/rikej.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b7477482ab18c8b0f3aed6f46168d4a6/62817248460.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/lemagisegukotedikefori.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/15842981338.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/14111565787.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/10698972649.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/40802972478.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/10387608236.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/61191157821.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/xemezujufuxunewalukub.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/dodexeju.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/delopifuviboturowuxozuz.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/65719853560.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/19306005507.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/98818437987.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/34343361635.pdfIn PDF document text
    • http://df-2.de/images/daten/file/jowivavuf.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/fapalizegakapimexitedesun.pdfIn PDF document text
    • http://rts-3.ru/upload/files/nebewiwujaf.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/zikow.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gg3r29id954jk0sistjd1634a6/25054646586.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161415da9c136e---43919681474.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/luzajuretafakukalasifob.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/bepipowigeragivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ptv+journey+planner+android+appPDF 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_off0000c19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19F 18864 bytes
SHA-256: c44b081a414779006a134d31393660a9a14e826f06e0385f89560eeae488234c
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 10628 bytes
SHA-256: 5111f9ce0ede15b3d16ca973f2005e47abb58d1f734e976190ebdc665e8dbe59
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1