Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a62457cf18469f9…

MALICIOUS

PDF

119.8 KB Created: 2021-08-09 14:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abd60aabc20d6ec33e8fc1d790ce109f SHA-1: fc76e8dcc5086a6bcf6cfaa00c1e0ba2d42beca0 SHA-256: 6a62457cf18469f9f5607836ea2c8447f98ebbb11784616405ea68e50ba62889
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=ms+word+2010+tutorial+pdf+in+marathi PDF link annotation
    • http://www.prieteniitehnicii.ro/documente/file/zepomobagudepetikapifume.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/bevajanigazigo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fumibe.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/rizoxexi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a451fba24b8---gidejerelukukonirunagukuk.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/putoledumodaxe.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3761ca1040---vatevatasovunokiwupeme.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52109685549.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/28681593288.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/15639887325.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610619c502f28---94210025293.pdfIn PDF document text
    • https://eurotig.ro/file/30031406348.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/91808512472.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b63399e219c---80662311428.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/nelonixajo.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/252112315078.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5db971215---25526229126.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/55790706842.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a544a01580b---55614818554.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/91925656164.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d88ca3ab---76887743629.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/wexulivonanaso.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610000126fcb7---22389760751.pdfIn PDF document text
    • 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_off00016f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18746 18036 bytes
SHA-256: c260a53ab03846343d8e6d577bbabadb94849b91753429d422fb71e10cc3a681
font_02_sfnt_off0001b6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6CB 11104 bytes
SHA-256: fe3a3207a5cc1795f202fafa34dd25627c56990830928e54d9ac2316e05c554e

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