Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c528d55e895b718…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 09:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 395892fef56c558a9e97c841bd94853e SHA-1: f86692dc142b0b79fd8b57ea30ab45782ccf6643 SHA-256: 4c528d55e895b718cb83a72138c5f1342b631cf766184bec7f173c22457a5d1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites, potentially for malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=jj+benitez+caballo+de+troya+4+pdf PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078a07a63a92---firakofoziwugupubijax.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608736e1590b9---53833313380.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/lodasigesolivoriboxoxok.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/61309866525.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/30947305381.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/54702194865.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/39565861191.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/2832116773.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a11590d4957---takegerufupugafekenigimag.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/buxasazemulugusozovamovo.pdfIn PDF document text
    • https://kopari.hu/files/file/vifosurogisilibupakirux.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d7vjc6gh1ti6lvj3gfbguafaaq/fukemekutelojitewexugote.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/pizizi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/piv2tethrt6u12qt03s1mkjfd6/18674570494.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/13892027724.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c2sj5djjsa9tguna3krp08i1c1/14713314853.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094670a66c85---tobizutokobokonuwibobeg.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/sidavomukamoxegimup.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/40276403355.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05cb9d78d2b78e1adab0c6cd53bc500c/molof.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210b85ea43---jikarowimudavup.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a341d9241ba---jutiseneremuvanuwulolife.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/taxugenuleguwumol.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/godugakilalobuku.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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 20276 bytes
SHA-256: c405b6352ff3305f3fbc3a4b32160a25dd617764d5e2f0f3e0363868425ae9a2
font_01_sfnt_off00010bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 10960 bytes
SHA-256: 75b0582c64a229e0520ac2ccfa8774525349d7427e113e38461c111ea2e0d569

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