Malicious PDF — malware analysis report

Static analysis result for SHA-256 de67df606e9dbfb2…

MALICIOUS

PDF

90.5 KB Created: 2021-07-25 21:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 010c91d2bf1f57f60c5aec50902f79de SHA-1: e00de8155eb23ccfbc42cc5658dec258afa8c54a SHA-256: de67df606e9dbfb2eb996617a8c4a313aeafa88573d738f48eb4e753c9fccb67
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://archinfo.ru/uploads/file/renometetaju.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a3b97fd4---depitujobepufex.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a2dbc76fe---25102043735.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4d0fde6b358b75a643c4a6c526b1174e/rivazoke.pdf
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/78163435785.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1782f3df96d55f69f720d2dbd53dcabb/siwajefajuwakato.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0cbe794a---femoxogugebo.pdf
    • http://cephedanismani.com/images/pages/file/jikanir.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00d80f359---52180686511.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/cfe9e2ab3ac83a3e7a6acf4bfe6ede25/dulokotoge.pdf
    • http://lindseyderence.com/userfiles/files/jijupejawujusadujaja.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078599a69252---21460491507.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2eca7a27d10466f3f6b857c2ff47ac8a/laxinozipedetivimanekufid.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f777d311fa3---96303790381.pdf
    • https://anaksemut.com/contents//files/51514012118.pdf
    • http://billedbutikken.dk/articlefiles/file/vegojululano.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/45525253779.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hns9u2phmn4nte39iqth479210/17069805295.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/1020323021.pdf
    • https://dineflon.com//files/50907142053.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/xivapeduginesu.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/28184124756.pdf
    • http://worthingtonpark101.com/userimages/xejelo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=geometry+dash+hack+apk+2.11+pc
    • 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_off0000fc46.bin
d2ea2c85321fa884592899faa61b9bc1d47f99a56c0758335415a6b2776c129e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 11020 bytes
font_01_sfnt_off00011623.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 16792 bytes
font_02_sfnt_off00012e35.bin
eaf213a8e499d4ab177e2dadf4d737873d5e40da867ee80e761caf12362f47f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 17404 bytes