Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbb49fd69da9f9e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-11 06:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8519162a4a9eb2d887c5e251798e955 SHA-1: a0b0d697d1f1c062726fc60dd3053eefbd17024f SHA-256: adbb49fd69da9f9ecac4ca548da8a1533ebb14e1f7a993c583e33fe0dcc76e64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to PDF files hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content through the link farm. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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 http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/58725768343.pdf In PDF document text
    • http://les-dvorik.ru/userfiles/file/kugolulijenoxanopujafisuf.pdfIn PDF document text
    • https://beaszemin.com/files/zaxanubunoxatodufemanuf.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109060922316183.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/diwijodazenakesosalafe.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14d0051bf---84109329149.pdfIn PDF document text
    • https://hoavily.com/uploads/files/batujupewevogetum.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/wufedefoxowixi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/57769022439.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/fimixo.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/fifibokawuwavonajifuriv.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/gipupidexogemibadatikagi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/mavun.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb4646b04---25880804413.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/60747413816.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/40631678736.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/fepezamokedev.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/82381251655.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/dozaxu.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/gokivax.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/17699131529.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/digasurivifulosik.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/59614607972.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eac665610---79788677446.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/82042959766.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/xazodekafobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=new+emojis+for+android+freePDF link annotation
    • 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_off0000b4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FE 14428 bytes
SHA-256: 30e7cfd4f1ab21886ece4e26d0fcc5c0360497f841e68f13dd351a5f1d71a6e2
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10564 bytes
SHA-256: 41d38cbcbc59d9bc5d43758707cc6697ff325491130c91d331383e502915a2c8
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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