Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be51cccfa3e49fd…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 11:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7029173dffc6c299d7576054ddd08406 SHA-1: 5511d9fd25e0cbb9244195114f799a0c36cc198a SHA-256: 4be51cccfa3e49fda0919b3bfcd743874530bf3b76ef0f108f131e1270dc9013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://aotwcasino.com/ckfinder/userfiles/files/nitede.pdf In PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ace2b94ded91afd3612163e3cfe877cd/zujowopojefuwivil.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/xugemilu.pdfIn PDF document text
    • http://vodova51-53.cz/files/vinetodugixatuvobezor.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/47153246156.pdfIn PDF document text
    • http://dgkno.cn/upload/51115452853.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/sirezaxuvik.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140b311a6c66---92922781983.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/647417cc4b9b2049372117cfe5a8f34a/96377339691.pdfIn PDF document text
    • http://www.77ice.com/upload/files/95129866593.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/erj3t6ioee0s9jgthpmr3i9fr2/53218367904.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/76108310786.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/52101946119.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gowixapefuvigu.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/25340149976.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/mafupenilubu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090123011678.pdfIn PDF document text
    • http://telecycling.info/files/file/pifokozagomokowuvubi.pdfIn PDF document text
    • https://panama4d.com/contents/files/kukatolirobuteg.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/kodojufunuke.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdcd11d4---94970102872.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/94096314805.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/xunabimopo.pdfIn PDF document text
    • http://skncn.com/u/files/dotaxariso.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5ag799fg03giom6q3gupdsirtl/79635906112.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/70780414192.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/92125660884.pdfIn PDF document text
    • http://cartopack.com/Images/file/gofawobarap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+battle+revolution+game+download+for+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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 22488 bytes
SHA-256: 0d645ce87d896b67c5aa3c678e9bdd0c3f910f854e773c83f33df7e2758d3e70
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 11016 bytes
SHA-256: c886113da3fb42cee2b71e9d2d20c601a5c99d1ae0af2bfc92843d6cebaec186
font_02_sfnt_off00013585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1