Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a62d2d1f541504…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 17:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37e6301d70b1fe4cdbec48aabdd1f725 SHA-1: 19e153f6c5705879c2183988b2387da129bd0466 SHA-256: c8a62d2d1f5415042e88a5e6f89bb8481b5f2099ff4b20e7ca655866381b8f0e
224 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, some pointing to compromised CMS uploads and disposable hosting, indicating a malicious intent to deliver a payload. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs the user to execute commands, likely to download and run a second-stage payload from one of the provided URLs. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 9

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=excel+shortcuts+and+formulas+pdf PDF link annotation
    • http://etkenkalip.com/files/39090576363.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/87815523561.pdfPDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133462f603c5---towamojazasewuvufefo.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210921045339.pdfIn PDF document text
    • https://viceda.com/userfiles/file/lafimufogovigabumumadujo.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/7761106932.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1d8b2f24065cbc81dd08c8c185c1da30/tugeka.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161495e44b436f---37005454908.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zosojawurozeboma.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a689962eb8a63396f21fd680020372e2/28194434905.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6862619e---donekeguxevukafis.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/18690478337.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/dufewuk.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613729fa915de---zodagugitasirozojenizag.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/nowapukutemipab.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/40974071085.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/37696893113.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c28f0f27e---paxagawufabasikibaberuliw.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/64476288899.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ebf95771---52710820024.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/2881394285.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210916222638.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/54115825267.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dc1f4bd0979682657df2a95b9da2fa4e/33288198468.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/61300116498.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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 18876 bytes
SHA-256: 1b7b1dd7f416fb36cf2265db60cad41c47bde46ff0091934bfb4324f4a2f86e2
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 10976 bytes
SHA-256: ea55856f9eeb2b754583842c49e3351e1be6c8c8ba2aeab8eca0279e837a523e

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