Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e1268473e4af4e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 16:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7852bf4e9d0c83a2e49ca5c0648f33d7 SHA-1: 645b69854ff5507a025606765b6fa6a33b4ce8b6 SHA-256: 57e1268473e4af4e8b07086b27b11553824ea7893382aee28497552366fcd6af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://webinaris.training/ckfinder/userfiles/publics/files/32347700364.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/67222139709.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/banizumix.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ih3abitlpocci81idlra1bqokj/fefilulotokadogajexidoki.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/87360959244.pdfPDF link annotation
    • http://murielbellhomes.com/userfiles/files/4752016118.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/13411989784.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/xewemugamisi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/155944b0351a4eede4dee0e1021f6282/fogelumunajax.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161310b0f9946f---kumibolufidekipubokukikuj.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210908172827.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/lesisimoxikekoxe.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/96531701944.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/38524190605.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/jaxejunixazexo.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/morolumavujokema.pdfIn PDF document text
    • https://huanghecables.com/d/files/44113377570.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/16352963709.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/39461023503.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/titoxowibezuti.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2951fa24---wutakalasadikavisenosumo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cb096b3cb3e5c2a5286299aa8cf2d78a/86177589735.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/tamisutuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=five+go+to+smuggler%27s+top+pdf+free+downloadPDF 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_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 11104 bytes
SHA-256: 22c4a128f644d6e1685a40b764a118f102d4c12c985ac029e038110db1248c36
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 17208 bytes
SHA-256: e0ff5e5fde94775a926ae17fdf2711fc6a72a2433ec5eecb7abc0da46368ab52
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1