Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd9ac06d4840451…

MALICIOUS

PDF

97.5 KB Created: 2021-06-27 06:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 250eb0473c0564c95c01f22a487b21f6 SHA-1: 05f61f9e9aa3e0731c96c82c513c5a371448b454 SHA-256: 4cd9ac06d484045127a4d1a45aec2072c0bbd016f306441e96f80f8e7f3ff628
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing malicious scripts or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://queure.ru/uplcv?utm_term=how+to+give+yourself+op+in+minecraft+realms PDF link annotation
    • http://leakefamilyreunion.com/clients/63964/File/puzutamep.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f566fcdcfa---govijapana.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/68214913767.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/32988390226.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8dc48afd9326b4b456494ad4ba432c50/26411322438.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5f76f161bca02e023889784402ab0f30/valelogikat.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6540a7a8---21203088741.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ca17cdc731971e51d9a1519d49c79be/bupigimurun.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/79517407016.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8m3k2fjc9bg3ub762muq1lm716/99805051748.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zumon.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kstd5nj0r19ibkmv1bcncla31e/94272328107.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/xuwodopomaz.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731485b7247---80651750724.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7e6a6950177c660128a5844784554712/dekepemifasabukoj.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/81245919679.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e8bbbe2aba3f41f5bc23848ce4b70018/fibilipowudolibefe.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ek1op7fitjere7k11vrbf0gk84/batonabatofaporapema.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/38463497902.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767905c1f75---dipugiteropigafu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/17125986173.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/dekobipelekukofilozifego.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_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 18544 bytes
SHA-256: a81d0c6d4ff985bcbe5edffa5ba1163fae74b12fc12376fcb5682ff32894e8fc
font_01_sfnt_off0001463e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463E 11180 bytes
SHA-256: c87f52b5f51fede54ade5fbb63ca0090d21304ad18120af36fbe9959fb442329
font_02_sfnt_off00016073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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