Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59ce92f438eaf2d…

MALICIOUS

PDF

95.5 KB Created: 2021-09-21 05:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e14e80a1dcabd13698eb33434a8f5fdc SHA-1: ac8e4a98a6f16d810e1812a509ab0522ccb6e5b7 SHA-256: b59ce92f438eaf2d2b7c3e7ff5d26969c8fa3b615a647b5e3668d5b3e703b9d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious actions like further redirection or exploit execution. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://eklyps.net/images/file/punisizoralagajabimilop.pdf In PDF document text
    • http://www.gabrielamaciel.net/images/content/file/rajipobuzifosixux.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/ponavukumuzogufovuzeriv.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302cd0f30f7---95241993398.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/80583928222.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148827c9dae8---motugavenavorikudula.pdfIn PDF document text
    • http://aminotp.com/upload/files/tanip.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210910162526.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091649495130.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/jipedagawupugano.pdfIn PDF document text
    • https://norservis.cz/files/files/74500942396.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109110242555791.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/fetipewojiv.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zufidolufirurudur.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/nifitasuwijobubeveranixon.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/60479248287.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e532225a9---2420040628.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/14114230142.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/69423488135.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/47710538601.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/judegoloxowarozoxapop.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/jipenobejuwatakixeged.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/34715386472.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210912_28AEF27BA934A9BC.pdfIn PDF document text
    • http://zerosquareonline.com/file/gekopivigekatozozetewej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=battle+royale+3d+warrior63PDF 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_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 10560 bytes
SHA-256: 81212b1ac080065fb0a52e5dc686fc886c4dbb367d94fc411b8bd9632eab3e06
font_01_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 18636 bytes
SHA-256: 61684103eea4f36fd6fac0702334dcdb8c9fc864f19a5ee4f28348f15e5407aa
font_02_sfnt_off00015824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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