Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70029a27aff1bf4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 08:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c0484a6013b7d010e652e395bd0a418 SHA-1: 5f07626360bc626a73fc374ccd9597374527ce36 SHA-256: b70029a27aff1bf453121414b0b59ea34d22df77ed14659627eda563a8f56463
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. 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 or downloading further payloads. The ML classifier also strongly flagged this PDF as malicious.

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://chcial.ru/uplcv?utm_term=hobbs+and+shaw+movie+torrent+download PDF link annotation
    • https://termofriz.rs/files/jivogefogekotijodebutemot.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/zoluzisalojaroneja.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/37359602491.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/7080681011.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/70348072747.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/8335152384.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/48203115022.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/13e5ebbfe7b1261193d27092a2697ad7/kepoxamipepabeb.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210909055257276227623.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/pitizasili.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/rikigeziwab.pdfIn PDF document text
    • http://medrea.ru/upload/files/xubuxolaxalabatomezes.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_667D1FC5C7DFE3AF.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081756379895.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/23522675564.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/mokoxeluge.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/16181285878.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/tixuxovopigogi.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/62305950887.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/gekujodawizasote.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906092724.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196225413.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161380e95e5161---wumiwazolarodulugeweges.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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 18412 bytes
SHA-256: 568b863481fc14c861f5ad7f93424f83dfcd0a476f44c695680aaeccee34f854
font_01_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 10796 bytes
SHA-256: 4ef9421df2e41b5d4e5a30e12fd7bd2596809f534a362d974f98d0ce74156649

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