Malicious PDF — malware analysis report

Static analysis result for SHA-256 9231dd391849312c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 21:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3624faa356a028cff4338937549430f0 SHA-1: 8698feec45ac0af0009791f321282a22b9cb8bd4 SHA-256: 9231dd391849312c487edf42b97b3989edc7ed1a53095d418a838fe220b42560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. ClamAV detection and the ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e6feeff9---52451114752.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa05df07c---7991744420.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/winilufisufapunemep.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/87466904198.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/tegusosoxev.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210912230427.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/kuvug.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/86189620004.pdfIn PDF document text
    • http://vaynhe.com/upload/files/koxakuguju.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6fc1c803---lobixivutebe.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akabujulagokofovorokevi.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/79890127295.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/zamulitaximawasogediriji.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/zawesaxixemawimobogi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369ab6b3bf8---wudasubagosatamizelijomo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139950e2ea40---zitotuf.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/3871217536.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/norakurukob.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/nojilebeviposoxo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138751d54f38---92276707.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/19096091873.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378db23e1f3---73958317931.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/26964455932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ps2+emulator+for+android+apkPDF 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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 19052 bytes
SHA-256: 300cc881d93ca70df1e82de9621e16de9ab6e8fa1d64763988f70eb70e71ef06
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 10972 bytes
SHA-256: 7747519a2bf8b9e18788bbebef8bb729b1c7c3e4a93753b258d5606440dbabd5

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