Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe53b169326b2e2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 19:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4bea9319dce20129202d1f1e9d2faef0 SHA-1: c3cd5d07f902d690556da6dab957fa3bb33c922d SHA-256: cfe53b169326b2e299512a6efdcd694e929eff57c44688be2900650b3dfb2156
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into their shell. This, combined with the ML classifier flagging the PDF as malicious and ClamAV detection, strongly indicates a phishing or malware delivery attempt. No scripts were extracted, but the lure itself is sufficient to infer malicious intent.

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 https://crewmak.ru/uplcv?utm_term=mac+how+to+select+multiple+photos PDF link annotation
    • https://thuhuonglacquer.com/uploads/news_file/9412901604.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/57673601582.pdfIn PDF document text
    • https://digireg.dk/upload/39321758838.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a51a4b89d---gimitofagimulusemisenagag.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/norupowi.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/96664963346.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9b877360---48354237626.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/jugeruxoj.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/gavevajutelolivogo.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210909_847BA8D5640EBF2E.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/92845253723.pdfIn PDF document text
    • http://apicn.net/upload/files/54518969374.pdfIn PDF document text
    • https://braus.uz/images/shared/file/10274840429.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/1945012383.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/nemerimumonisavebofora.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/ponatinugezetabizubiselub.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/pusikabozizijibitu.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/2202341677.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/35750466915.pdfIn PDF document text
    • http://geotersrl.it/file/vajome.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15353356223.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613786c5d1a25---94244079248.pdfIn PDF document text
    • http://topp.pl/_topp/file/dujopoxowobedusezosi.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210909110818.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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 10616 bytes
SHA-256: 563f94244fec4abc238f53c7523012ff3d1c2cf5d3a1452e601bd679d22a052d
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 19360 bytes
SHA-256: 602cb2284ce89e18b6be63a1900c5a10a5aca687a4f2d4418b2f2ad806b408b1
font_02_sfnt_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.