Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5b8e54146b5393…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 10:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce91a2f94945741a90db73888fbb8216 SHA-1: 82f360b0cfde34812aea261c7a08e62df47ffc55 SHA-256: 6b5b8e54146b53931b9349342938dd192d8123278360a9546c95d595a22a4cfc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://basketaci.cz/UserFiles/File/16712520555.pdf In PDF document text
    • http://gdlianyu.com/uploadfiles/file/minexopex.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05e85b05d---luximadoxoludikun.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nridbutkarjrdvi4hh50e6dm64/71119317883.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dewer.pdfIn PDF document text
    • http://artospace.com/pics/file/nupakimavasemanovalo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/q7vl6fktlqkdi7l6lba5dmpve2/gazipezinaje.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/wadotalederijiri.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/37944340920.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/43640931799.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/70752802823.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/520b5bd02d05a68c216e6cbba35fb184/towarevabovisuxuguzen.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/sigegoloxilutan.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/96060676245.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/tetuzeji.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/95890663712.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/vutijoruvatotade.pdfIn PDF document text
    • http://freeorden.com/media/file/87421421151.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4j40lol3jspbfrvk04u268il62/xirigupar.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/22917686873.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/22143749886.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/datezen.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/39210603045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+a+spectral+arrow+doPDF 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_off0000b297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB297 16284 bytes
SHA-256: 1098d986bd3fad4e9c068d80ff3d51459e3cc9b5d66c3fd1fc016f2a872f6cb2
font_01_sfnt_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 10492 bytes
SHA-256: 42bd254a80e56ba2bb99ba82a38156cee080d6867cc08ac188f9e0bf2d84715b
font_02_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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