Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc90ff4bdddac5e9…

MALICIOUS

PDF

88.9 KB Created: 2021-09-11 03:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9655d603132c85f2938bfc81071daf19 SHA-1: f110b1b57278a340c277049dd50d79900a707718 SHA-256: bc90ff4bdddac5e9bd5d213469b427a81c4113ed9301dacd03660709fd3919d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to various PDF files hosted on compromised WordPress sites and other disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely prompts the user to install a browser update or extension, a common social-engineering technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cp-tournament.org/ckfinder/userfiles/files/vesuxoravoratewudewifugo.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb4ca32dc---wasimufogobuxotexavu.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c42b6d81---7191901119.pdf
    • http://chongthamphucthang.com/images/news/files/suwolawonekudozowexonada.pdf
    • https://grandiosieventinuziali.it/filesUploads/file/vumebimuvedim.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210905_7ECE2480ADFCAF64.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/lilepegasuloxovibisafeb.pdf
    • http://bordahusfeldolgozo.hu/editor_up/gokarafow.pdf
    • http://stl-hk.net/userfiles/9422363647.pdf
    • https://hotelharmika.com/assets/userfiles/files/66800651763.pdf
    • https://associazionemusicaviva.it/uploads/file/68220145718.pdf
    • http://avtokit116.ru/!upload/files/resirobidejonuzov.pdf
    • http://www.anclupnapoli.it/userfiles/file/detilokizenubovevof.pdf
    • http://otpetye.com/images/shared/file/muwatavubogo.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613beec6e6fa5---miwesisipewirovokukuvom.pdf
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/rokuzekugonafirorizamaz.pdf
    • http://remobudostol.pl/pliki/sopibunupiramarevi.pdf
    • http://pereplanirovkaoblast.ru/pict/file/58873306402.pdf
    • http://mueblesdepladur.es/1/userfiles/file/20939428790.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/jumaxegekelu.pdf
    • https://duhocblueocean.vn/ckfinder/userfiles/files/95745600161.pdf
    • http://iuoooo.com/filespath/files/20210831233119.pdf
    • https://maintogelonline2.org/contents/files/finivapalebomidelekuj.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/65726571897.pdf
    • http://fatamorgana.fr/uploads/assets/file/43702160378.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+chrome+update+not+working
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c2.bin
43cc8dac32f75be5d726351b99e34cafdddc182f8c5cc3f3ecb731a44ad824b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 17612 bytes
font_01_sfnt_off00012462.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 16792 bytes
font_02_sfnt_off00013c79.bin
0280bb6cbb7297e55ce3dd3c29baf5139953781f962421551ff1d831d618dc7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 11004 bytes