Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c3bce232da59ee…

MALICIOUS

PDF

90.8 KB Created: 2021-08-11 08:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 022ab197c5be664cbcdfdda116417913 SHA-1: 5064697f8297bc53387e7a40d6263e7e693e26c2 SHA-256: 65c3bce232da59eecf3ca66aeb755a4ca028a203491544559f960633b0bcdfbb
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61c325460---46757921125.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/be4bf5f559ccbd70b496dc56c9aa5fc1/38218397678.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a461685c768---80731460203.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/kijirunus.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/jevazarekoro.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084614698748---15885281213.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/loridokurewumanozot.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/xeroberumudewojizaxiran.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44452b2d05---rinovatanariwu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/vb72ul37v2j42i9pchv3mg4hv7/gibib.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/22349670050.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/46558479760.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/gilukol.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tonakitunowenufokuzew.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/38417956113.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3b74c6098cd8b1a284422152ae8ec5dd/juruxetunirixegizot.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/61350471651.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210607203451068949ta6uhx.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/93sea9use8gbsvoe3lct6inlk0/fitikebubidularezumuvesav.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dadf883f2ba---72212272658.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210624_E9BAC9FB823C2C48.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/576b9967b730f134cc96871051c6d3f9/74408182086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ejercicios+de+parafrasis+mec%C3%A1nica+y+constructivaPDF 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_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 19060 bytes
SHA-256: c1d9366e98523d24960ea61031ab5f021012cc43797b9eaadaa1f7d625c8362e
font_01_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14021 11308 bytes
SHA-256: a4c2c8ab180e5404dae3223dc40368ba32f6aef0ba11d2a7acc7749b72bcedab

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