Malicious PDF — malware analysis report

Static analysis result for SHA-256 e516354c1ad38a0f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 23:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb0a3efd442da6578c06df4db96bd765 SHA-1: 9376d84b95137bc3f64f02d51b4cb4490b8cc359 SHA-256: e516354c1ad38a0f2d5115e4df9642d89336c32bf1e1b56ec2d2d383a2459283
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://299-45.com/CKEdit/upload/files/33089363239.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf9d37ffc---nugimajopuf.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aad6130ea---2665991504.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/5115841867.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/eb1ae83c88200aa29a22ba306d4c6c51/14089715591.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/55458379711.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110187ae0cc9---21195621429.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7d0c632fa29b60087a4e8302bd6e73b1/mavevodabolumizogadobex.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wetiduvo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb5bdbc42---mimedemerorukigumifog.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/muxetunonaxuwu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/falakilet.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b737686c---mexoxugilokogenevenafu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0d0a07b7360549416ef7273834fb5a07/gebedutuwudujawosebotaku.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8147b1d6a---88746037750.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3aebe3e1f---25379888469.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/cc79a0e7b99bf7818519b9c4ad3471e3/39073758289.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976f83f001a---neladowewobatunorumiku.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/90259585163.pdfIn PDF document text
    • http://poiskvod.ru/images/file/56173740065.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/48374224342.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/75222564368.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96676a84a4---teseguzogujagizun.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0b07db09c0461512bb03ea5da3d7c1ea/sigume.pdfIn PDF document text
    • https://jambukuning.com/contents//files/fapupopavojareguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=investigaci%C3%B3n+en+psicolog%C3%ADa+pdfPDF 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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 18024 bytes
SHA-256: c566131c6e20876c47045135974ce70ddd48e31c2187f1034c929766dc0ab909
font_01_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 10912 bytes
SHA-256: 4bf17315037781f3a7062575754318a8253e88d5d6f15204fcf9c9df20db4121
font_02_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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