Malicious PDF — malware analysis report

Static analysis result for SHA-256 1284cb0799f6f999…

MALICIOUS

PDF

84.6 KB Created: 2021-08-30 16:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f67e1057e6d00d9d6ff5e350eacd8db SHA-1: 03bd9b4f965660b8a0e674eb5163754dc0e61116 SHA-256: 1284cb0799f6f99984ecec6964d9b19f34af25371f14f1939e8742b34c5a4bd4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be directing users to external URLs, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crewmak.ru/uplcv?utm_term=ear+wax+removal+hydrogen+peroxide+and+water PDF link annotation
    • https://abugfreemind.com/userfiles/file/nobiwogan.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/zeruvebepusematoxudedo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/61c54266a8dbcd7b3b07594fbd9797e5/67591402382.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mizetasomebu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5faf69150d---mofafim.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/zunelow.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/ravogedoriwu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb2cade6e---zabeloroxozupefusob.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/12575589385.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/69790919460.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae39c421a1d---35768256050.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8ac058907a19c7cf89882fe7ec45744c/xalofesewixu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b6e768d646cd742577247c929c8f59af/gekivepeko.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/bumireterekijegunafeladiw.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/dafexiwigut.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/sulawojutenanosafadoxa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/19629027594.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/75756633145.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af3ee3fc1---lafejapevizimubiv.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7fagpf2vdb63bln4s05ndsel9m/35182001614.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/1148170042.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/molize.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/69887630426.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/82200771335.pdfIn PDF document text
    • https://elemonbg.com/Files/File/semobegukawonapujaw.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/43912682050.pdfIn PDF document text
    • 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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 11024 bytes
SHA-256: e2d42e99bcd5b1e1818401781ae11e8779b035d291fac097090c5c963bc9e437
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 18192 bytes
SHA-256: c35954cd07e5adad97c456f68edb238bd0808b9be8c6b2590b65b5e41c083378