Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6ef319af0ae697…

MALICIOUS

PDF

91.4 KB Created: 2021-09-18 18:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c219c346a69f353235d351a0970f4284 SHA-1: 574091be5d3c96a18a0f705b721661099eaad848 SHA-256: bb6ef319af0ae6973897a2e4dafac80a13fbafbb979f64e8f249ca820cf141d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple URLs hosted on potentially compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=descargar+mapas+para+oruxmaps+android+gratis PDF link annotation
    • https://svltv.in/userfiles/files/50902150818.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/23073120530.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437142ae43b---95018307290.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/30912247204.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8e902d852d1903b3c2e73dc734229124/38963799536.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091410373058.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/tuzifipuripigomi.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/rigupazivubabigefunabe.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/98434914057.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/61514613078.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210913151139.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/15703360126.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28410731338.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/98610839380.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/55682664461395ba27fb31.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/66310671103.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/ruxefoji.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/tedikesevuwunelakufizimup.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/maxivagitofiviw.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/pemimuvojufujekifaj.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109161524279707.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jadodurunijuvivisi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3204d57077f337a63a9282841ec0f25f/77043179402.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/jivatokerapujiga.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/mugewozopoxobavituke.pdfIn PDF document text
    • https://senfina.top/uploads/files/wunedumevapekofo.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_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 11016 bytes
SHA-256: 0ae917b1859268c301867b1a9f4b5c4994b1187ffa7cc0667b8f53d391c9e5dc
font_01_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 19648 bytes
SHA-256: 897d09450d0179421efaf302169ee41b86a0d31bf6c73149314759a54a75ae25