Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b91e566664cbdb…

MALICIOUS

PDF

83.1 KB Created: 2021-10-09 01:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 31b0a1d11708569a9e767a850ec51953 SHA-1: ef68c1a648b97c28326cb9768da642b25f473822 SHA-256: 05b91e566664cbdb543b5ebef7f926d140a4fab516011fbccac848c85a34b165
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised websites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to distribute further malware or conduct phishing. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=how+to+add+signature+box+to+pdf PDF link annotation
    • http://crmloccitanecr.com/campannas/file/16531037807.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/91590056702.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615face24d221---padoseforexuporajow.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/27845831691.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/3569088735.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20211003203814929.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/bopomowofiferom.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/londbio02t30g6u71tgvjva5hh/wigizedotixeluzepuf.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/29882083899.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/58260971037.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/duwoxijeti.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/41414308929.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/814bba87a19b09e8b42778cd857d01ee.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xinabovadagav.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdb2e3555---93329395177.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/57961112878.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/patepikoro.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/fudum.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/liwaxelidegematozudebadi.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/sotesaj.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/86344401826.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/78937tp7koso77u8hdi816vvc4/juxinuvuwujul.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/71990813554.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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 11044 bytes
SHA-256: 1744e1e07cdee40dda80a80cdd815e3aba26ac3b65263dd61b109ef19aea7bd1
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 18856 bytes
SHA-256: 563da548062cd830a559e3fed2f977714a29d71558906530f40e0c5bfba0f059

Open this report in the interactive analyzer, or submit your own file for analysis.