Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c23ee257a72c8bc…

MALICIOUS

PDF

90.6 KB Created: 2021-08-13 14:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b4705b0e9774871f2ddaf0b9b04c36ff SHA-1: 88e8d82fed15dd04fb4a3d305aa26661ccd271a1 SHA-256: 5c23ee257a72c8bc7a8e71a9799958af708e710e6c7aff3277b4280ecfde01a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdf In PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/edh5pg4i2avg7vr0d6vuq4ue31/98554484700.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ffadea47214---birugenukozojanenetoxuxat.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c6fdc2527a39c5a19613701082652e24/26786605296.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099916692d27---17377009480.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/jiwaxofiwiwuz.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080162401bf4---zutagobufujok.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ac1aedd4---87612785994.pdfIn PDF document text
    • http://parilka.by/var/upload/file/91278333483.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/39470648513.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370d642201---93780804349.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/44319067092.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021053023424813.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd074d4a1---46126733404.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/54620317572.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b15424113d8a6acef3150f356097248e/suvizuxifofagolenivi.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/fokata.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3595b4d2369cdff5448c00cd74bb5b8b/leximibegumazoliwovobi.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/936499873.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/set6cloqk6bnmdq28dj7v8dkd3/mupoper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=asuran+tamil+movie+download+tamilplayPDF 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_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 10900 bytes
SHA-256: 17c3cef19a05e2d39ef4ed8490988829404f7511ffa86e95b9bfed6e8f7f1689
font_01_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 17068 bytes
SHA-256: 765bd5f118054a3005d2c6a5d5b67bbfd62a15c1912657afa4ba151fec0493cd
font_02_sfnt_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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