Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43018156b883759…

MALICIOUS

PDF

90.1 KB Created: 2021-08-26 02:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8628aec37964d9f27660ab5b4492d2e9 SHA-1: 92b6647e1679edb16268847846ab04d756255866 SHA-256: c43018156b88375925937a39b71f34ae9cc8be113cf1d1be6e260e653526c8d0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, specifically instructing the user to copy and paste content into a command-line context, which is a common technique for executing malicious payloads. The presence of numerous links to potentially compromised or disposable hosting sites further supports this malicious intent. The ClamAV detection and ML classifier strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://dongphat.net/upload/files/fijukoludajuk.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083331b29816---xajifitob.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/tapozipumo.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210716174118.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/t2obq7kik1oomqmmc6qs2qfqf0/bakobokagafofumafe.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ff9d811b---zixewugiketisereseza.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/69397263712.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1be4e471---mizipen.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/pukirej.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/5751033465.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zawigamabiluretakebomibu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f98a3af79---81365659165.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/jowom.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/10671912723.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/66964523015.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/30558148850.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b990d2a238b---pevumuvawewekigovegasofol.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/38012153163.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/56628394522.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/76875586680.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/81968466978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cut+and+paste+on+pdfPDF 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_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 10384 bytes
SHA-256: 9075115f722f73579a9ea84291b032af6293f9ba1ad5d95805ae0a8d3aae490a
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16896 bytes
SHA-256: a55683cf03a126f96fa081039e09922269bbc04f3756d41d9eb8edaab1696093

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