Malicious PDF — malware analysis report

Static analysis result for SHA-256 197c8b3eb5e2f2e7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 21:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f818e13c90052d908323456c182e1c7 SHA-1: ff43af9bf062f9d861eb61a3b8266536e3c117f3 SHA-256: 197c8b3eb5e2f2e7a128798cfeee3f6c3201a5a125e6739af9c89ca9b55c2f42
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.zochrot.org/ckfinder/userfiles/files/jipomarixibevuket.pdf In PDF document text
    • https://goldmenu.com/userfiles/file/luxigopimaxekoweta.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/32668290638.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wurogaguzobo.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/vuvewolizupisawaveg.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/dotilafomubu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/9566603964.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/68714736965.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/30727720323.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f86fc59ec---48442840857.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/57968292300.pdfIn PDF document text
    • http://makaroma.fr/upload/file/jedegojevinopujorob.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/79978162031.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4aabd9394---48442757748.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/77664824931.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/titefatolemowonoda.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/31a34cad1ae387b8dab30210e45c085f/devuzavagebunuwubenu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/puveleruzesefolutusuze.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/87062383057.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/45558423014.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/zilixatikivimutog.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613508141674b---96403802958.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/75429422328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=exagear+windows+emulator+mod+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_off0000bcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAB 16120 bytes
SHA-256: 6beba3a31b4c128fce6d8d0ae7034c9abc113e61ab29073aec95209ad47a6cbd
font_01_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 11100 bytes
SHA-256: 49f05ea1658758b1df4300169aa3e7881dc8baecfcc1c4526490b5fd206d4801
font_02_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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