Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13525b0dbcbfc34…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 16:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edcb25599f3f05098a0c8f9fa3fbe92e SHA-1: 48c9e78e0252da5978dea7316d371d7917de805c SHA-256: f13525b0dbcbfc3499904f68e2270648ba5676663bd75c7bc2fa52f2d6e0e6ea
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as malicious and by an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious commands. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=adb+usb+debugging PDF link annotation
    • http://ihdbd.org/upload/files/jogepobikabewosi.pdfIn PDF document text
    • http://safarang.com/basefile/files/nowijutusakarovanu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/fovanagimojagepapi.pdfIn PDF document text
    • http://sin-hua.org/userfiles/jamumanu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbbf7333f---82329912789.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2fb55b40---70231741858.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144725c86f0d---jafikopog.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_151949.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/90991253881.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ufoqu5vk8n5uk7400p48p2b3oh/tebizomirekubigenidipel.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/nhosdruened72p53cdronajp5d/54598537371.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/81686854175.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd5e4b87eab13bfa1fe45e364c29f76d/zulezatujad.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/zatajata.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4adqnbduavsd872qu6d3igo23m/gekoruwujojo.pdfIn PDF document text
    • http://cl-pub.com/files/files/fuwusuleximenan.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/duwefugonabapapudunuw.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/29707747476.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210909114929.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/vebisoziril.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/78167de0214e9820c467f2b92b47b58a/31283197380.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/texuzuzir.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d59789e5f4ece119882efc1ea912779e/53232206423.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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10116 bytes
SHA-256: 46df5a293e6eaafaeafe6d97ac4e79b74acaf468f35155e651f497e983810ecd
font_02_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 18040 bytes
SHA-256: 1b9ef6c3a9c73df9798b30b3358d58eabcfeb51eeef1e923739f216f9ed771df

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