Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf5dffcd51c5fd3…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 15:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1cb415c89f193c29229078d6b9329279 SHA-1: 8041ec6add658996fbe0c2f6dad16bed7e013fb1 SHA-256: 5cf5dffcd51c5fd3117bbc81b82d062d394f8984f012a01d105964cf256317e9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/27673953686.pdf In PDF document text
    • http://veterina-hrib.cz/user-uploads/files/lotipumibidilutabemes.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094744c32cd8---jerapawubakev.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce8195509---kodolajufiz.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///lakunobu.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0ecff83bccbb88a95351ab8ea332d9de/relazusokulujigidex.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vokoxugaf.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/nenexibuwuvozuk.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i2inakjvkd95bepk07tspubiq0/12238604697.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/296b46a63c1d66bef1363a4f2ec65d21/donobifi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/23274953864.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918f1629008---sixirapapowi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb67b09e---86416184994.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kolowaxevigogowigamorup.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/fizawotev.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/05e5830d2812f54423743ed78baa23c8/24016746543.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/gogepegodafuto.pdfIn PDF document text
    • https://abeess.com/userfiles/file/40160071269.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gdh9sj5moo9ou2l69ihs2gdrc8/41876989038.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/p9suufvtg0htm25k8cagjum3h6/99361449128.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9430c88cb8---76381261078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+way+of+godPDF 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_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 18280 bytes
SHA-256: f63dab10527d304cccfda8bda31106536e03be8d2a8f240ac9034691ad683038
font_01_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 10188 bytes
SHA-256: 0c646d1becd292a9e70d94e6ce9580ba2cd578b401af11fb18e2b8bfc82b9302
font_02_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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