Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc613ac3a0df14d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 03:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8af9dd8968109ba8af689ea2e0617db SHA-1: ff00c1f77866ad0f47f811760010faab7f432ba0 SHA-256: ffc613ac3a0df14de4a67f3bbfc75978c77c4f3eeabaec3dc9f81368974e27f4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a phishing lure. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates it attempts to trick users into providing sensitive recovery information. While no scripts were directly extracted, the presence of numerous embedded URLs, many hosted on potentially compromised or disposable domains, suggests a phishing campaign aimed at credential harvesting or malware distribution. The document's structure as a link farm further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://soudurelausiere.ca/upload/editor/file/zigusenox.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/82a61c42a35e2d2725a10ef4d60336f9/gawidolunujozesodi.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/vevefilubaxotirenoja.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/13343905264.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nufedediwilaninepinuva.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/74944830262.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/sawisivatu.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908081714.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0bb79ac16de6e8fce2aaac157b29743f/zodotafavirofagegato.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/pagifavetu.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/20525787529.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/49570093884.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/vozipigisoziwaweves.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/70665525504.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/bubevakibasareraxudir.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/26174276670.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gozosironetemibuxiniv.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/pogujigoraziwimibidunudok.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614748acb90f4---42248501107.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/71160469050.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/kafuvef.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/delokuvi.pdfIn PDF document text
    • https://anup.bo/images/files/zotizutubu.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/musujewewidopikive.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210916_25A429D35F4F0D83.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/ziduvozapepiborojepazizot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sign+in+webmail+outlookPDF 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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 17796 bytes
SHA-256: 829e8e78b1171e5fdcf8b099a970a56752723b9a113888765046db21c00765d6
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 10676 bytes
SHA-256: 2a15841e46a5b1725964132e657149a866dca0102e5a1f7c6873ff13485fa6a1
font_02_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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