Malicious PDF — malware analysis report

Static analysis result for SHA-256 076d8554f47b5192…

MALICIOUS

PDF

85.2 KB Created: 2021-07-14 00:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cef1754b27cdf28708f995d4bfab79b SHA-1: 6e9cc59803b31cf5a9913bc3e8750eb589856579 SHA-256: 076d8554f47b51929590b676a62a6626156dccce3a73e4e5474492417b9e8cb9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm strategy, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coreaad.com/DreamDataUpload/file/49294449157.pdf In PDF document text
    • http://chupanhnoithat.vn/upload/files/kegumowi.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fqcnfh0nsmqnun3ok1iv4fqbue/11684355476.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/88663469228.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/nimuxudemebadufobaz.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b7ff3e8f285c0dc4a2af466447a8cb0d/najemenagiwu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3f458677---renufiwilogewopixapel.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xalejopogomupibiv.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/65764350475.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8445ee53---lukewavuwun.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/bobisokofato.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510d090ff4---6764771259.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160835d60693b8---45901029073.pdfPDF link annotation
    • http://sola-brothers.com/userfiles/file/dasomi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qd4ak4s64teb86eidmus7dllj6/90046708825.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bsq2olf47rh3srej14tp0ir4bs/58081279499.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tupivaron.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/74995301205.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1fb56c65f---87689565755.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/67155328874.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/mieor6n8b0aq8p7qi1862l03t0/tuluzozetekaponejuka.pdfIn PDF document text
    • http://kgmda.com/upload/files/56876667381.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbfc7b8050---31347296775.pdfIn PDF document text
    • http://winso.tw/userfiles/file/xakalunopezikorusutegusu.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/gamuvodilebegunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+tie+a+double+snell+rigPDF 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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16480 bytes
SHA-256: e1e21bdf484270c0d022ccffc9f022bc789a358fdf8e87090b8bca0a609df1fa
font_01_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 10740 bytes
SHA-256: 0aad6b1210cf66c98d09b0cfd631be3dbe39dff7619575d845b64e682fa7c2d7
font_02_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1