Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a6e8a879d2ce23…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 88a1ef20b68147f20dd3148a12cb42f5 SHA-1: 6f61de77dea1fe0f06d0835c6db80dd7088232b9 SHA-256: 19a6e8a879d2ce23e19222a1f825b25de0a22fafe64ad28584ebdfe97e7753aa
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://semihkerpiccilervesupersound.com/upload/file/navuma.pdf In PDF document text
    • http://apsencollege.org/test/fckeditor/file/41209569928.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/fobujisujafomu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-1/20210901230324865375.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/razar.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/35129437742.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f72624d5a---fokuranosam.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bebiridoviwit.pdfIn PDF document text
    • https://buka.ru/sadm_files/ruzulagiwewovamefige.pdfIn PDF document text
    • https://digicpictures.com/downloads/roxezo.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/luzatimato.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/94518910639.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/55290237313.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/bubetizadato.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630773007.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/789899284.pdfIn PDF document text
    • http://voijin.com/userfiles/files/kokebufovenikaluba.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c7d25dd3---61600598389.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/kapiz.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/23001726532.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/pozunosisu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2326ag8kcs4916sed3ifngch3t/tegowopiz.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/56490793459.pdfIn PDF document text
    • http://yuli-china.ru/d/files/finawepak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+night+that+never+happened+watch+onlinePDF 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_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 17788 bytes
SHA-256: dc6e71020c8d3ff4331963e6d6ab20e921c0541f9b398b2e334be626057ffb01
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 10740 bytes
SHA-256: 66b70804028a14f1e29a47069de35a52adaf65e8714ee48aa6c5b27958499e0e

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