Malicious PDF — malware analysis report

Static analysis result for SHA-256 e338342266733f94…

MALICIOUS

PDF

81.9 KB Created: 2021-06-24 19:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fc0b645a5e74e90fabe10ebb029bcdd4 SHA-1: f4d00c15235c6aaad653bb506338ae3f6cc444fa SHA-256: e338342266733f940b57b8388c73bae5c4485a35109959bb664654235e411568
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of these links indicates an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=ullu+app+web+series+charamsukh PDF link annotation
    • https://store-connector.com/_upload_bilder/_filemanager/file/87514454233.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac877b131dc---morexumitixedefoz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b425cf09---47275520600.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/boberobaxenilotunip.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/79434496173.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/38033206718.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/524fcb726f7e703e88c849ad565d719f/72265873951.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be141e59f3---favemonanubunu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe892d893---98631251450.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/63502587832.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/97528651525.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/60211834414.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072aab9dd5d9---59916795440.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607abcc15b402---tetukiwuzod.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021062410101136.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sujesilovaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 5460 bytes
SHA-256: c8977ffa43936e5fddb69f32b2c02ba2b46b9dbf9a531321f019892384de524f
font_01_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 11112 bytes
SHA-256: 82222bbf8feb001dba4aba59f52638e3e0a51a81fba8ef27dd34cce4d723a217

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