Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6e81d41b941147…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 03:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d1f6a379b2a7400060bc9c5ef9d39b4 SHA-1: 1dd3af94dbdca95442e49f976984249b98974b31 SHA-256: 7a6e81d41b941147c5a914da39d2c7f4b5231f3bada5b51b095d60b2be65bc6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users through a network of potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted from this sample, but the extensive use of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://allytemp.ru/uplcv?utm_term=principles+of+design+in+clothing PDF link annotation
    • http://avtosfera28.ru/userfiles/file/gorefekivovatuliwi.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109132057317619.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/setujoborowa.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/dibogopefururenofogodiw.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/dalotepadorimesa.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/wufetusomodeka.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/gekipafujofininiwaxob.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/98378524343.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916221614554342.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tafagifevarubikilo.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163140901215304847343.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/82850923120.pdfIn PDF document text
    • http://hmed.vn/upload/files/3993777994.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161441aa81e66e---58444436748.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xomajasezoboj.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/58632375416.pdfIn PDF document text
    • http://hengtongblower.com/d/files/vomefekabeje.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/37900483018.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/91088103876.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614729729e930---86048480627.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/52250968467.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/nalomorupegogezofar.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/feriworigesalutejetugaf.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/58979250511.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/xulaxufak.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b42f2ed7fc5a963caaa74ca0f4a41794/pexekapinaxudijelodikufem.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_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 10736 bytes
SHA-256: 2f6e628d384a1d78dea53eaa216c4b0dd600a145ee5d37a0dbdeecfcdd034d58
font_01_sfnt_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 16412 bytes
SHA-256: 2bdf882602aca7c1381801e8e200f57a4ee9c7f1487d0881465df28225a180d6
font_02_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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