Malicious PDF — malware analysis report

Static analysis result for SHA-256 17928aabf3a7a48b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 21:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56b16e0e12a59e9ba54327cf1f432490 SHA-1: 3caac371b414b6aebe225da02e2e4f8b7a83a570 SHA-256: 17928aabf3a7a48b6ca049bb124b31c0d33f563d8341ed5a503c93b24bae1038
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://visualarchive.bg/files/fefitevogijedota.pdf In PDF document text
    • https://cytokin.ca/upload/editor/file/nevadalibadit.pdfIn PDF document text
    • https://media-get.com/userfiles/files/zuzawup.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/sosatinodegetunetojepo.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/1408998602.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/lutawisiwogifegamumilugor.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/29540640552.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/99434704798.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1fa3ed813c9b34dc5db40e1d3ef3f95/48308158207.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/92039915250.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/bolobekibaxujexotimefikeg.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613948cc41f07---watosem.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/roluf.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/334d689c10eeee86535044e0ab48178d/89605819968.pdfIn PDF document text
    • http://getvisa.ru/images/File/65527907750.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/42758192927.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/26333607257.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/41120642572.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/15693650513.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fafizofiwaduduzewu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6b8771f684dae81b24ca75c22441aa48/98394650026.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/1332936156.pdfIn PDF document text
    • https://tierlistei.ch/downloads/32637061485.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/70726402625.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613236cb4349e---zuvuzurasepoviketu.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/napazalunefojijeramadamuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=room+33+2011+watch+onlinePDF 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://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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 10824 bytes
SHA-256: 345b3d52a37c51d52679ab76f31fb73ff9c290e3b7d5f871e0a7cba0dfa2919c
font_01_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 17796 bytes
SHA-256: 6ca4e1fbc16e17a7033d1b5ad463e3fe6fbf2ce3b75455661e675d7e733e1701
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1