Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba5395abf45b7f0…

MALICIOUS

PDF

84.0 KB Created: 2021-08-18 13:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5f7408941e5bdf367f98ad498c554cb SHA-1: adce12d181b535c6eaf5e71e4dc8c1e6ae35f600 SHA-256: eba5395abf45b7f06e4fbb4777a0d681faf3e9336069995131447a99540a6dda
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing lure, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c5c616cc---mobokosut.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ff7e40a0---jusikujivegutikatekoteret.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/66352038814.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/xakuzik.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a3c4bf2854486e216e21975cf54219be/vudulozarux.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/87849927118.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/pupatarugezasoz.pdfIn PDF document text
    • https://megashina24.ru/files/files/wukaza.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ffag3970oeg3521ueu17ebqcmc/66031631280.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/nenavenekexuve.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/43600902632.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/o3a2fgp6benenmsqb12j2nn3k5/vimedebirexewegajo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708834d3f9e---malin.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4cc94234---xizowabaxifutesozoxir.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/bigevinizupaj.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202108/file/felusedovujatawazusabo.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/vavoropawavuwegadon.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5c77abukdibrkndhaq46aodnu3/70784522597.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/rudilajupedorodiwesuto.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ceee9652e56d3905025e5900c478b8a5/leverizidedikolirufet.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/bupesonupasejinin.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vesok.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/wowozopejagevemab.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/928d643bce2920dc0141cf6eae31dfbb/kuzuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+create+a+break+even+analysisPDF 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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 17188 bytes
SHA-256: abbc67aa9b6e233f1ce4d7fc67cd8e7b019223693848cdf5f7f942c5dbf8ac38
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 10712 bytes
SHA-256: 2b4854ae0a22d0786416ff2f95bb5badc897c8221ecd77e4f023a8b248c6eee9
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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