Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cfdfb65de8d3fc…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 09:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 264e4a07a362746ec1f78410af217390 SHA-1: 0001c46ef32483fb93b4668b23240eba775f6a90 SHA-256: 57cfdfb65de8d3fc557f8e895d3ea3c25715badb078d7c4e9e1bd5a52fba0a9d
164 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URIs and pointing to compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'Download' button lure further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=cengage+chemistry+for+jee+advanced+pdf+download PDF link annotation
    • http://lookkorea.net/userfiles/file/58143283798.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8981969bbb7b17dafb55fc02e37c7198/ledetafulolufil.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/96358879119.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/k6v9r4uluv36hi2dg6q3f37k8j/tisuz.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/23225899335.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/leniferufurib.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/baliduzisageforo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-19/20210519145048817974.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/ponuxipijenifabotalemujo.pdfIn PDF document text
    • http://fnathservices.com/upload/file/vofaxesimonokuxawam.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/u9dhmojdgeain3ormukm7loi15/61036090540.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1193ccae5c08b9ef7c5dc0abfa43e54e/susowuwopaliwokifufo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/72941651586.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/luzitedosowijenox.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/99411270526.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/10343064622.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0f7d1aef2---kunovofipulodepe.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/9406394282.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/62916311493.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2039e9660ad30d389bcdc5ed3eb07fef/padoxuvudarivobamodunu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f35e964f7---82100168367.pdfIn PDF document text
    • 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_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 18008 bytes
SHA-256: 7c45ec4a12487e3947ed54834800996fd74fb0d9228d0df2d39aefae425879f7
font_01_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 11492 bytes
SHA-256: f1ec14b16d952d6e1ed3f94c769f531b314d8d53bb6a77c3f1dca88fa99215cb

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