Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca495dc37b090f61…

MALICIOUS

PDF

87.3 KB Created: 2021-09-04 02:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf39a4a8ee851698d96cc792c3d2bebe SHA-1: 13f270e3d5877277a0f64cf7d8a18a4b33d17a45 SHA-256: ca495dc37b090f610d95605ba8e0ac5e18ca52a1dd29e154a1e2dfe2d8f0b475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=kicd+curriculum+design+pp2+pdf PDF link annotation
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/83a58bb2fe70d707196a620591d82f56/nalevujusojelukemasoxekuj.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/zagono.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/52517407979.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/puxuwapazupatidenob.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8693b5bdb---jixuvara.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa63402d5---49425871219.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/paxesolagabolotunisag.pdfIn PDF document text
    • http://warungmimpishio.com/contents/files/fusukol.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d79d27f7f---jideremonapisodexapurobup.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/dusefituja.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0d9c86d6---vosiwojumuxefonajawa.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/91667354be94de00b91fc1aff1328a34/tebefokojuluwagu.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/33787023983.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/zenaxadesonigajunedipu.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96505701019.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9b9a99f4---74982381833.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/89382807939.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zufomovorijodotexo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c804341b7---19373394889.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9d1b552e89a2977a8288178817d1abe5/18078121650.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/38164511473.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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 18708 bytes
SHA-256: 196f6e8147a99a68b1923fd2e0134b12a4ed07cd22e95c0b604dce3ecd86827a
font_01_sfnt_off00011f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 10792 bytes
SHA-256: 77aff50775d5f543c27ff3e6fffbb273d6d1f85b53cf14440dfffe4bef58366f
font_02_sfnt_off000137a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.