Malicious PDF — malware analysis report

Static analysis result for SHA-256 183c24624d761c63…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 15:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b640eb2e9ac1acae4b072138fc6628ab SHA-1: 89a53724b8ba73e588e5fc9a903daf9c34c0c63f SHA-256: 183c24624d761c634f9f3ddbc6159ed2e40df710c93d771b744ece06ceaa37ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://baheth24aqari.com/ckfinder/userfiles/files/tumesubo.pdf In PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/karixunoduk.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/2077504844.pdfIn PDF document text
    • https://marigabung.com/contents/files/52124380849.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sabexitozaru.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef71043b4---vebotiluvipesejinanogulow.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086f43ab8817---58268529928.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/81633558110.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/67176250331.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/14212838879.pdfIn PDF document text
    • https://aokman-drive.com/d/files/kuseruxexos.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/xuwariluxifipuvize.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/50415089949.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/rekixeg.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/8152755299.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a2eca726b9a187d366dce9fbf00e1454/vuwupar.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/48677204924f1ca7131ffd5021f3baab/kajatako.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/tinibenokoneji.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507230101987696.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbc94bc96---nepasanepivuzudad.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/daxitosa.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/bopetasuzikobeleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=with+the+goal+ofPDF 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_off0000ba4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 10116 bytes
SHA-256: 09ad14642f2e58c29f4c21690403455d03e141d8beb6240977ccae6cc3dc94c2
font_02_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 15896 bytes
SHA-256: a7a48153ac9488be98029802377421a7f2833ba21ee92e94b5ea4fa663847552

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