Malicious PDF — malware analysis report

Static analysis result for SHA-256 3246d9a2f289efde…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 17:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e06e5aac554eb345d423bcec9925a4cd SHA-1: 39a8215e8be4ce73639944337206822abb951b21 SHA-256: 3246d9a2f289efde65f39539e07bd4a9ec12782db2dcec07fc18647618577e9a
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. A critical heuristic indicates the document attempts to lure the user into executing commands via the clipboard, likely to download and run a second-stage payload. Multiple URLs were extracted, some pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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 https://tarsiman.ee/files/file/xisizigulogofowosif.pdf In PDF document text
    • https://aqua2go.pl/galeria/file/7215396618.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c653c8bfa---77389831622.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/bezevavifuxanesote.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/33780130483.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/verelirovujin.pdfIn PDF document text
    • http://bdsductri.com/upload/files/53253509743.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/tazutozariwes.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/17978911718.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/44558593446.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/61337682823.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fb591c9df5fa00bce655fadfe14f38be/gokazovudo.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/76544320022.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/ratilelefikuxofixivabaje.pdfIn PDF document text
    • http://npas.ru/pic/file/84930182575.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/mebukaxixesebumifodaf.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/26845194591.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/43628957119.pdfIn PDF document text
    • http://honghuibio.com/d/files/45568104499.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/lesisimoxikekoxe.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210908004942.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb2f2149e---nulepakufutamoterodapaw.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/67736915735.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/5895072009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+save+file+from+print+optionPDF 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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 10660 bytes
SHA-256: 57f74ee1c13d4ad91b2cf0bace5807546b00895d59f5b5cd4662644385fa2ada
font_02_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 17760 bytes
SHA-256: 28b877c85d173be2ce7b40bcae634538af13bf8e1b711dd0bff5a0ab1e4270d8

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