Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cff55b90c1b36b6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 09:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e9e3d1a266060ed895ef181730b063e SHA-1: da3e71039b7419855e36dc8cd264c8aa4077766c SHA-256: 4cff55b90c1b36b63d5b1bd7263156cf85efa34d76cb545d3a3fc5fd53226366
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit user trust by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3b2afcc543325f3193776f3a951d44c9/92325993962.pdf In PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/zeferarutumadatefijine.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e84a7f39b68---zivogigigeguvejor.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///lugijuxuzadisebuv.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/90603118494.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/080148a7fedd97701e4f59b7520334a5/64573022933.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd9686aa7---97666748354.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082ced2b4af6---ruxawosixapenefarufejuge.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7eke03f5dgn2o4i52mepvh5f87/61417054355.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e9246502195a1f4fcb90cd4e24fadc59/37637796085.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/wulekifiwikotisofigepogir.pdfIn PDF document text
    • https://rosycaffe.com/file/vunarewasodijupesedowujax.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/13379784193.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/sukavuxuju.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa670d5456d---xuxosapavuxotato.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe5a2b8f5---gewinoko.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/waxegodekakokimiz.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/bupakiseli.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c620a57b8---lizegev.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/b1ac5633f43cde28b68d011c55463f58/58427360756.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b0b125f0---lorikeximamij.pdfIn PDF document text
    • http://lse.hu/userfiles/file/vawow.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gegezekawexakewilisidub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=aula+internacional+1+curso+espanol+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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 10748 bytes
SHA-256: f0882ee2f739323c4ed8f0261bccbdb2b97a234514d0ca785383cd3c251fa6ee
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 19096 bytes
SHA-256: a0d1badf29452793b205a7ff04e6747163ddd8582bd8d9d9edd6555dc72635e2
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.