Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8d1044ccfc75b9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 10:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5c58a634e6df9f798df284c8af911ec SHA-1: f73e7b1da1adac931468d8ee857c8165967bca59 SHA-256: 7b8d1044ccfc75b9fcbc428b7aced03929b519e0572ccfcb30c2fcc8081ec3bc
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to download and execute a secondary payload. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste commands into a shell, a common tactic for executing malicious code. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=bridge+for+android PDF link annotation
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/72879884967.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/lusetomeviwuxox.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/zatarezixujidapef.pdfIn PDF document text
    • http://chinalabware.ru/d/files/gopefowevesiredavux.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/zolewikulojava.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161376e9248b02---7850015297.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/76284105816.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o1k8uceqrjccdl29g0u1qsngt3/saselijovogutobivoropew.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sajejelokapu.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/53756876077.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/gexisa.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/jekivujuwijesowu.pdfIn PDF document text
    • http://ingore.cn/upload/files/vilewonumenidefiti.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/roborugodek.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/72091516962.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/1106190822.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/nijututimosogunadozifezo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6417a9e0---xogidelopivutaxe.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/69772462115.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/solabadivewusu.pdfIn PDF document text
    • https://korankertas.com/contents/files/piroroxifiwerelaxubegofax.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614033415bcd0---jilixujatufimem.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jiretupibol.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_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 18916 bytes
SHA-256: 8cb682d81bbccbf85f130ff65c55a78dcb2df2fc0874994471c932d7e89bfa24
font_01_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001335b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335B 10272 bytes
SHA-256: 0c242ece0786e1667c472a58a925bed3663c37728507cd13f8efd5569810aaf0

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