Malicious PDF — malware analysis report

Static analysis result for SHA-256 c055be2a701245b1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 00:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5cd5643761b241262c9952b1fe447ea SHA-1: c8b95f67aee93f7685c7d77554771a0358f67bcc SHA-256: c055be2a701245b1516d4b434bf2e8a4c272592155d0645aeeae9fdce143f441
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple potentially compromised WordPress sites further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161429444037fb---kiwaf.pdf In PDF document text
    • http://technoprofile.ru/userfiles/file/jagagofakarigabovosewagef.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e251ec37cfca40d1440851ffdf12355b/479788348.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/bunel.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/88404620236.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fadamujup.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/32108685413.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109170547284834.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/xinudupexose.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137717b47f8f---bozekogafevediwi.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jemur.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xibovirej.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/nofibikenatalob.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/18835478272.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349f8d22f56---69010468635.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc197067b7---vodivawanubonujadokufage.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/vasur.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/rimupebodusilufizu.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xikuzonolifolonebemo.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/tosatejasafumekifosiwam.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/jemadawovazabukato.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/75067845993.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/suboxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=angry+birds+apk+iosPDF 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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 10616 bytes
SHA-256: 96a844d56380b1e05215939fd93ee7ed684bcb24bc3783c1ea563cfc31397603
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 16732 bytes
SHA-256: a7e81ca13fba1a6ca53f9ebdd7555765cfa42d9932a01413cff363113071dcb8
font_02_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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