Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b716b8d1313b60…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 14:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4666a790bc9e24734baaa0a50ab582c7 SHA-1: 396400c238e2ad69bfcaae9831b34f9af4e76fb3 SHA-256: f4b716b8d1313b602213264f81541a356a9519ebd0b9830e5a36a8f5e69d2c2d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading a password-protected archive. The presence of multiple PDF link farm heuristics and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggest a social engineering attack aimed at delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/42525dc78fc249770a990c7c8c176509/5721382435.pdf In PDF document text
    • http://shoreluxurylimos.com/userfiles/files/bulilokufinuwon.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd82ee618---63093290759.pdfIn PDF document text
    • https://gilbertems.com/videos/file/vujikefabuvopazefalosidis.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/kuduxuvuf.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/64059667233.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/43163340024.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/zavipef.pdfIn PDF document text
    • http://mobiliteit.nu/files/64801746562.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/94588647893.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/29842296157.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161394402222e2---24661365537.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210914115544.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/besivobibifisogixizi.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/lelusowizodarabisukubusi.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/pogoga.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/82045682663.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/zipevalinulenoxax.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/fenuz.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/rupumodowopa.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/8768096897.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/sipitalena.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614111f9c1b75---vadosot.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/sovefexakuginu.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/1165614748.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/75926504319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+you+print+a+pdf+on+macPDF 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_off0000b80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 16832 bytes
SHA-256: 2fc0044553de409a2d907588c7b798b7272031c7a5a32381b7ff9de4c2e14cf2
font_02_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 10724 bytes
SHA-256: bb2ea344888c4fb7e7902d4c3dd9e6a98e024ba39e86ec19da3e9b9386fa4c37

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