Malicious PDF — malware analysis report

Static analysis result for SHA-256 9145b3048cc3816e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 04:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: debdc8f9b09dfd7b5fce6d22d204e8f6 SHA-1: b4074af696f6081160bd99fbb099a942c3deead8 SHA-256: 9145b3048cc3816e8b68115148633193d7aeddc3c83ec219edd6818e143d8641
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zkpower.net/upload/files/lovuzanoxumunajixujizal.pdf In PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wikifofilibibena.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/fozovuk.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161322ab73608a---21986664868.pdfIn PDF document text
    • http://huefpdf.org/upload/file/83893352110.pdfIn PDF document text
    • http://halmar.info/userfiles/file/zenupaloku.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/42281079359.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/4659585991.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kububepeken.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bavisuletarozezuxowak.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/54769843616.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/baroxaganegusunekogamo.pdfIn PDF document text
    • https://proia.bg/userfiles/file/37890370605.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/besegusorafilozitopuz.pdfIn PDF document text
    • http://handgun.ee/media/file/99804272705.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090801174173499.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/82b98f33b3150d8addedd99deb8a7efe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6f8d42e9---napapejuz.pdfIn PDF document text
    • http://immopolignano.lu/images/80469955721.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/31223797382.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613956b15da23---vazolud.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/misugewidas.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/47561378295.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/fojol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=little+nightmares+2+apk+obbPDF 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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 17124 bytes
SHA-256: 2d9ad41a783f2b0c1bd3ab2aa32e5dee6123821bb3e248e0ef251c9b0ad1e30b
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 11008 bytes
SHA-256: 6295bac62bbdf80c3fc8b0c6378353b1aa8ff44d70ea6179eda0b75cfdfc1c20
font_02_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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