Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a7ae60a528fefb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 08:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7e44d38e349289aba6eac814a64c56c SHA-1: 9f02874d353813092be8dbd4b72a3c18c8c1fa35 SHA-256: 18a7ae60a528fefb810da7832df824a31f5fd2bca3b2aab8c24d140f7550052c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kururlaub-ungarn.de/bilder/files/33365289174.pdf In PDF document text
    • http://skonasystems.com/userfiles/file/28294557924.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/39131825298.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c280484e4f6---luvilexoxowi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16e48dcc8---52036142696.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202108292312027282.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/xivofofobiga.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/milibukajarikulorelisig.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021081908230573499.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/64949797861.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xonapokafunatokesanol.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/85313678194.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/96554462.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/joniginasegif.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7df7cbefad0aaf2be344fce3f216514a/rawezexuge.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kigalosanesapewojokuz.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/5972081778.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/35327168636.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/25800177360.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/79725322732.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77379722620.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mv3dtgo89hvmtfbn6e9grb6ii0/lojoruvawip.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f868a57c4f---61579334054.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0f57500b---68710323942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=7+quality+control+tools+with+examples+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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 18984 bytes
SHA-256: b7b541af387807745e80183765f63bc840d1de25063685cff3f8cbf2ab0c974a
font_01_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 11384 bytes
SHA-256: 4894382a2eda2f897740a64e04004774535cbcde1179f7fc114301ef62281046
font_02_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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