Malicious PDF — malware analysis report

Static analysis result for SHA-256 682b2b9ec06f884e…

MALICIOUS

PDF

81.0 KB Created: 2021-08-26 03:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8e39a10755b6b67209ebbd04a67cd8a SHA-1: c914886c1a7d94113902201756e6fc54014c1c07 SHA-256: 682b2b9ec06f884e4dc945b4d75fdc55176f7edd126f03f978ddf19f456372fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. This heuristic suggests the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious payloads. The presence of numerous links to potentially compromised or disposable hosting further supports a malicious intent, likely related to distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16077c352c8af2---45997941585.pdf In PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/32072867640.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/55bfbaf6b8eccd6abb0a58610e46fddc/diwunetebe.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/72447032428.pdfIn PDF document text
    • http://goref.ru/files/file/77715569427.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/titusiwosotojuvi.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/42670945628.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/58628288055.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099670a93332---53420229805.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e95dd5dad---24856735817.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/sukurorejekegejugu.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/delopegufifizulumajif.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a348cca9fdc---nezokerakovinujilaxuniwe.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/kuweluraxefivovasipotajip.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/kaxitowoduxenijuzakum.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b43d0823eb9---koteja.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e98db79f8---63078981163.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/sijek.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/gabud.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ae0a676237972fb4a0ed5b15e595182a/romasatonulidodusiro.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/51060657191.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d2a3b4f504b60a8748716e76ae5f0b6d/xutazidufuge.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6ad18bdf---zanado.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/tolof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=php+string+typecastPDF 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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10600 bytes
SHA-256: 9def54e8b5639c73ca6090a7e1775a37b685eb80759a1b5b1dd1c4a457b68c9e
font_01_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 17780 bytes
SHA-256: cfd61575fee910d4246068b32c503c6929d475e5826fcd4a3d627ce9eef7f91e

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