Malicious PDF — malware analysis report

Static analysis result for SHA-256 4193dcb6cb77bc59…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 23:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94dc58ccec5f783d0087fe4211586af4 SHA-1: 792ad6a38a5fe131f2413c7345f41e2930771257 SHA-256: 4193dcb6cb77bc598d3bd1a97a3335e4c95a35f3567b674a568ac03008d2e60b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage, suggesting an attempt to host or redirect to malicious content. The critical heuristic for 'Password-protected archive handoff' indicates the document likely instructs the user to open a password-protected archive, a common technique to bypass initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mkpstroitel.ru/upload/files/jogifozifasajidikebi.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41eccdb09d---fanosekuweluzesosobeferam.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/43746644188.pdfIn PDF document text
    • http://carszana.com/image/upload/File/dubolijawofinetazewaximav.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210616_F8E8E138E17DF5BF.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/72226203393.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/ribewugaketozuruwiz.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/4980550577.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/35221771359.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c40ef79315c---vedevukak.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f6b557f9---35202523474.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/xoziwefuranunibemulakuwof.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/werawerujuj.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/61786769721.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16883737650.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6601aec68e---gazewotewofapumaxasanitot.pdfIn PDF document text
    • http://nenorm.com/files/files/57161788038.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c8833ce642a4292706342108f05a1156/45755861626.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/48366628836.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b195dbb03cb---19990970679.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/25828378604.pdfIn PDF document text
    • http://faradbox.pl/files/file/55350778905.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40d73a3265861c8f632bda7f63c67326/81682502958.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/17710919916.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe232fc8c11---41073431289.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fab3fe4ebc35ea236eb4e7c5fee7a15b/99945238102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=redimensionar+p%C3%A1gina+pdfPDF 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 19968 bytes
SHA-256: a085233352efefccb8c365251a66ac84d54b6c7799d457259339900fd150487d
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 10924 bytes
SHA-256: 3d8832add1ac56eeb023b184b65bde7d5b7131613ff54e63cfc2dd1b55bd8c4a

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