Malicious PDF — malware analysis report

Static analysis result for SHA-256 303add57df1004a2…

MALICIOUS

PDF

88.1 KB Created: 2021-07-10 03:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ada703aef00112f29b917a9f01b4b86d SHA-1: c57c2b1db7481b3b220758947249fb67fe3f3373 SHA-256: 303add57df1004a2bf60de7f3b6dcff2b6c580f22db9ce2aa420ae230203fb4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=food+open+right+now
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/af901d421b416ce6781fb01fc03fca18/rediferuwegutat.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9d9efe7c99796d6718c82bc43416d38e/89123647093.pdf
    • http://kotolantopeni.cz/file/desisemugexosilixozukifal.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/posajufabulovusokopav.pdf
    • http://melly-incendie.fr/img_db/88178024256.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c9808ded5---39460870467.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16074484335d51---kufalo.pdf
    • http://phantasos.org/userfiles/file/xopibufuneguzogusigodu.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/08d2ea1e8e6cee5dd63afffca9aec2c5/zutisixekinozev.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jblp3sqc3gs269lbol1hkd4hsb/lezetimin.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/fonisiw.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/julokirurojuf.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/lesugezit.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa0018cd4a---13158632291.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210609105046251407fuhpx9.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc168365a---vutorale.pdf
    • http://bayanairag.com/uploads/userfiles/files/48932495697.pdf
    • http://csc0532.com/userfiles/file/20210629121350_pagdcs.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607608fadbde7---pirosupefevu.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/jawozenabavelededo.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160736f18eab4d---mewezexizabixofizibepepab.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9e0cab77---78723866037.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/a7f517e4cda77f28e4bbfa06c9205ce1/kajufunepuruvikumefajaju.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5d2b5273adc012c9e1d84c645f344d9a/60909690390.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074468fd3756---vejer.pdf
    • https://pharma-tools.eu/galeria/file/90459776787.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_off0000f784.bin
cae75e03c2e4a8a411fbd76cd2b412742f0961702007f370dd874134d52bf9de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 17108 bytes
font_01_sfnt_off00012456.bin
7707c66e64254e76b69d6c61b1b7a5c9452b58f872dcce5985c4f3bd2e4041c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 10360 bytes
font_02_sfnt_off00013b70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 16792 bytes