Malicious PDF — malware analysis report

Static analysis result for SHA-256 40df2d294cf3b984…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 04:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f41914f19939998296511551ed9f8d3 SHA-1: 923fc3a674b19cdf7969e02cb693590601853b10 SHA-256: 40df2d294cf3b984d493dd3db3d225166b6da6a9ebd10bb0244dc017116c6301
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various websites, including those hosted on compromised CMS platforms. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or phish users through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hanlacsclub.com/ckupload/files/70664305432.pdf
    • https://swalaya.in/userfiles/file/posujojogose.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf38c1beb---67993349354.pdf
    • http://ngor2-3.com/file_media/file_image/file/98297245472.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/zabasa.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c9961758---gadidigarexitopopi.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/pizaremarezuzoluketupuveg.pdf
    • http://www.anclupnapoli.it/userfiles/file/91987707904.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a904165b8---zabozazowogow.pdf
    • https://dogathermalhotel.com/resimler/files/sapewobodovalidonogojemiv.pdf
    • http://ajk-opakowania.eu/upload/fck/file/43327623235.pdf
    • http://belloverde.net/emailer/file/84287993449.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/99012168158.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06983efd2---89815771916.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/dokamipesitulewujip.pdf
    • http://cerritos.songhakbbq.com/uploads/files/xaxutuzaluro.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57035172752.pdf
    • https://tapuionoticias.com/ckfinder/files/zexanaxupisi.pdf
    • https://istruttorecinofilo.it/userfiles/file/25950051088.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=her+movie+online+watch
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f177.bin
c46f63fd42fd1d119020c26fa079f75d789582c001c2a79c9304599f9aa64d23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 10472 bytes
font_01_sfnt_off00010906.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 16792 bytes
font_02_sfnt_off00012118.bin
8b41f3ee707c90282d78c127b0229963c27ef8ce6d7fd685320a875de21544ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 17596 bytes

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