Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f84549544a891f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-15 15:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a423fc8a9efdb9b0858d46ae6b08f36 SHA-1: 931a1b6ad04df9f73fbe35fdc8e9f2a1ad8615e6 SHA-256: 89f84549544a891f8729c5cb8d0d4a8b55c842dbea4729bb7cb406941dd100e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=magisk+manager+android+10 PDF link annotation
    • http://weforyou.it/userfiles/files/retejokewiwu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140f188cbedf---94313908361.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fipajoja.pdfIn PDF document text
    • https://tigapilar.com/upload/files/kotefadarexokojitas.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76055918901.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/26e8a1e16e1289fc91915d1e419d8c35/jexewagemesavubuwi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/70017943682.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/zewukugo.pdfIn PDF document text
    • https://fuoriscena.eu/file/vuviminumesasumi.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/mogutobulevojezunorotuvob.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912112654.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/87e95e9142e2f678cc7f57883bbb8eee/65806153757.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/28502067922.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/dadukaxenox.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/2949707926.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/94553dc11181aeabb1383a5a3f821a98/sapababazajuno.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/gelinajepokigafirideduko.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/14833529671.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/96532647878.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021091516542533492.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/joneweneda.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/kisobilidokoturokepifu.pdfIn PDF document text
    • 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_off0000b489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB489 15476 bytes
SHA-256: 3339435822fb2408f3054c478307bf9c9494daac7edc15d232f46ef17fa36782
font_01_sfnt_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 10708 bytes
SHA-256: 7f01567e492f0f29ab923779e154819de21147e716b58aff91bfccb0b020a542
font_02_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1