Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b97c0fc4726b5b1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 12:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9be9a344d878d1ed14012f5bc954853 SHA-1: c4def505f43182478bfa0adbdb26c17da535669a SHA-256: 1b97c0fc4726b5b1982f9021f41d3604131d849aa70ca9d60692ba68a91c702e
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload. The presence of a download button lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://congchung7.com/upload/file/xoniwoladine.pdf In PDF document text
    • http://rm-centr.ru/uploads/file/50823380494.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/makemonogetuwujonozilofod.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/92591381099.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4506d226---feridoteradez.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/63010254868.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/54561899247.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b557cd6d35276646fef5964545330ae7/jelazu.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/puxuxodugegatesixevop.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/gofemala.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613540d226835---20881799332.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/wanezufedunigoko.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/93779581842.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/karigulogidakitemuti.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e9488e66---94428341634.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/68972899881.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/wawow.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/diminibumebaxu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137b56da9a9d---29855110421.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/11790351004.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210901215641.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/8538408762.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/28191996561.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/giwirepozavitoripotuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kernel+panic+upload+mode+how+to+fixPDF 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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 17836 bytes
SHA-256: 778a33f83bf36f3d9b4e729524128892d2d2a4f4531f61add1cc5b44d1614915
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 10996 bytes
SHA-256: ad305ed9950b2ccaebbfc59767cfb2f69e1042e0d8ca6519b0c4c9c9ca4aeb53
font_02_sfnt_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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