Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c38eb09370dafb9…

MALICIOUS

PDF

83.6 KB Created: 2021-07-28 03:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6fd00603b786957a86285a8a29071e9 SHA-1: 63e5ff1d511d2d9c91a7f03947de7b8eec698a4c SHA-256: 5c38eb09370dafb977d29f8f6fb809a2a06048353a9bc9ad97687fbafd7569f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://shethof.ch/cgi-bin/dynamisch/file/dagosozadeditika.pdf In PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/gafenelurejibebosivewis.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/96616297817.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31a90c7f5---jeredojesizutu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949770d7264---kasavokos.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/tunimusoxeserenoregibu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/k4u8mojjpr24aq7aibjou0dltb/57747155323.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6e2743e3a14fc4cd4bbb57020d3a7164/tutamiwazusoxuluj.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/5275344437.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/835ae082f7661a11d33f3c1e3e74f14b/42800560092.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/79582552505.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784ec96493e---72243901025.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/8982574643.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ovp5kk2o1mugf1mhqpluogg260/dirafegobafipekodevapegog.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c9e250c6---90512216740.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/kisulirorigisifobedipilaz.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/jerotivolutuzirakexelug.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/widujeninizow.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/tizujiretuvufebakagel.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/neguzadabofi.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/91474244379.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3cc8d09762702925cce176966243ce29/pofefuzeputogivijutupem.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zozabafipogotatapexubev.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/76412982969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+ebook+sirah+nabawiyah+syaikh+shafiyyurrahman+pdfPDF 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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 11196 bytes
SHA-256: daee4f008056ebc735a3acf0eb08c85ed572da1ff2826deba4551ec3a27292e2
font_02_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16540 bytes
SHA-256: d9c3f9af7d5fbd22219ed22e90726caa920757a08e7253d2cd89fd8809d94787

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