Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbb76f9566815c0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 10:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6add9bef6c272260d1125ce1496994b9 SHA-1: 504c4e00d1b8fd860921c7ba04a824d9aad5de66 SHA-256: efbb76f9566815c0e6ea3c619cee34e148a99ca3d4877b5d8aff8d2963ab4da1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is classified as malicious by ML models and ClamAV, and exhibits characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute a password-protected archive as indicated by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. The embedded URLs are likely part of a social engineering tactic to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.og2c.com/images/file/56612886297.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c895676a80---fotutuwusiruvefisupenu.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/32022078016.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/94523566068.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd43f2c9cb---84154878722.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/54656618372.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/28801354708.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/69701992556.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/87365618086.pdfIn PDF document text
    • https://tch.lu/files/files/tewopar.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/69055120711.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144053b0a10f---xigixewowenis.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109030203338217.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xitiwewijomixam.pdfIn PDF document text
    • https://best-label.com/upload/files/webime.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/xabem.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/46418623197.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090823060073499.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/wedupevegodapu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130335238af7---dogujoma.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/34982944412.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f247be80be---75818257187.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df3974a979---57691363152.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/47516390393.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/28237927006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apertura+pagine+indesiderate+su+androidPDF 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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 10600 bytes
SHA-256: 1a1776c25eddd199e008cd52e1aa58016b7f5aad06b665998e0e592248329163
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 17372 bytes
SHA-256: 1e85c4bc1f811909c46a99bd972a58c68e1ce88167918d457f97ec94048af7e1

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