Malicious PDF — malware analysis report

Static analysis result for SHA-256 124648003b997a9d…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 17:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d49e496af5ff2396ceb5b0df4aeb2d1 SHA-1: e9cb8b6602c93f8e6473513a23e4c621a3d00bac SHA-256: 124648003b997a9dd9444018093966297e18f5dc8de44364322658c3fa1026e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=emoji+viewer+for+android
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614494db2ad55---85848575802.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/kurosagateziwijijejavob.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e990d11ae5---41630363138.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3507e2e3---96209685716.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139834ae5dfb---fopigumemofasilojazanig.pdf
    • http://futimisdev.com/userfiles/file/88934474440.pdf
    • http://volareinmongolfiera.it/userfiles/files/91148918228.pdf
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/27163244545.pdf
    • http://travelcenterpuntos.com/campannas/file/12265373229.pdf
    • https://paroles-vives.com/ckfinder/userfiles/files/kafubanedun.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141de75052dc---xitate.pdf
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/vunomevabujosusef.pdf
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/38004044756.pdf
    • http://dorrstrechy.cz/UserFiles/File/minimalarevulal.pdf
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/bokiroverutibamenu.pdf
    • http://compow.net/ckfinder/userfiles/files/53826144014.pdf
    • https://leo.tw/upload/ckeditor/files/26195988112.pdf
    • https://yar-net.ru/userfiles/file/gubexaxukakajezukid.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e60ba7089---ragokawibopukija.pdf
    • http://hanasushimenifee.com/uploads/files/88325938817.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/lonebo.pdf
    • http://yourhandmadeitems.com/userfiles/file/83952015412.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_off0000bd03.bin
077e8bf559460f3c2b8f7a640cb7c56475a084bdb73eb0fb3f94ee8242c5b2fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD03 10468 bytes
font_01_sfnt_off0000d4b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 16792 bytes
font_02_sfnt_off0000ecc7.bin
a456a538d7ee0c95952ae1507646ef5ea8dd534158c16453bf20e356efedd3cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16040 bytes