Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e11730c37d469f5…

MALICIOUS

PDF

89.1 KB Created: 2021-09-04 01:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 082693a2a40b932645c99c064a5647ee SHA-1: 225d51296fff60934ea4142884c0aa5c10ac5be2 SHA-256: 8e11730c37d469f5283e4b63a2b1c1f0af9013e47c81a90bc5ff63e29eac3187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/gizanasami.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b58d93d787---7418155225.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/62159860063.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/57140486579.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/fobegasetuk.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/vivimefazufovafeter.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a4251ee50c3857f9bda27d5ec28a1701/komubarizozu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5400a981---tekulevitimokepi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/26819394791.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cf31fbjmoo6sel5pmnklmidd45/dasajowoni.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/67958107177.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/vubunediwerimox.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/342fe928d407b6115e453e43a3a93c37/29332206305.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7aca46f8d0f64af03f5c6b0cd52a01dd/mesidamajizot.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/66161992093.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/wereneruxofanibino.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/78702697378.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/45046540233.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/nogoritalatixiguviju.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/67221400622.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/85682635394.pdfIn PDF document text
    • https://togeltop.net/contents//files/17955440748.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/31d5807fd3a258e8456004285b85d3ea/85948332322.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/gajex.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xutitetodibufegeramir.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/fojidukuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=imperialismo+educacion+y+neoliberalismo+en+america+latina+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_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 18684 bytes
SHA-256: 601731d2a5b9887fd925e4c53b5e47a04a32095d8c01d71e3d9ef8971f1795b9
font_01_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9E 11088 bytes
SHA-256: f77f511583f5350029063a897e3f2b05f559711725ae9f3870f34879d17d7e73

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