Malicious PDF — malware analysis report

Static analysis result for SHA-256 8704b505152fff29…

MALICIOUS

PDF

67.3 KB Created: 2021-09-25 14:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b80ff9ea3573a04ced5b24dd0d2d00e SHA-1: bb52f0e5fd59fe812b1e97de8acfde59b64e8c41 SHA-256: 8704b505152fff290b7276fdfb1d954ef52ccc2c5d86bff42566aff8183939d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the heuristics indicate a screenshot lure designed to trick users into clicking through to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://we-plus.tw/ckfinder/userfiles/files/52282826798.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c83886c---melilabezezizanalut.pdfIn PDF document text
    • http://e-district.org/userfiles/file/ropagudi.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/buworo.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/noboxozujugu.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/84945393065.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c66865fd---zapupojemawowezikeb.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/pisexixapawotinus.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/58408840639.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/63070718134.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/mesaxomepurudenogek.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a46c95146---94265283647.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/biwopikenivasotosa.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/92355250980.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/94316585500.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161414472d4744---jesuzedofaruwubuxazimo.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/timemarovifunakezofero.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/35235405911.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/92690118119.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7d54f2d9185903fc84ccef6b7c771089/45410801258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=transferir+datos+de+iphone+a+androidPDF 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_off0000ac50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC50 14184 bytes
SHA-256: 9b3a54da79508bb37bf795b9b0204293aeb7963f607774e0af8d34f8436eb1b6
font_01_sfnt_off0000cffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 10512 bytes
SHA-256: 1763fc491bbf5f8ba816d5a6af67760f11d29b785c70a41b01a503d980555941

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