Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fcd9093357f093…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 12:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a64d185e00e57f542b108b14641a90b1 SHA-1: d266787e30502707e208847a3dfbb3a7dc6356ba SHA-256: 90fcd9093357f093599e5a501e05d7f17e4c76fa62d0474f047185bcc20fc471
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=fear+the+walking+dead+6x08+online PDF link annotation
    • http://sp2wronki.pl/fotki/fotki/file/xopubafujisipoxinasuj.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/pigibodu.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/wetutur.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03aa8724f---tukabunimanupigotamagibe.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/dupejeputuwudibofewaka.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/negugirikugitab.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/14265078240.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135955f4aa3d---zegakikedesonimap.pdfIn PDF document text
    • http://skolky.info/foto/images/file/sudurajeburujiwof.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/petoxonob.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/46915574199.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/72920587057.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/78683165921.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/78878003481.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/95055508081.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/51570518354.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xidopanodunijidepamu.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dumesafoxevavetorokalo.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/26036958463.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00599f95e---94859054280.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc73abff0---zubumutuxivazafuvobisolus.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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 16732 bytes
SHA-256: f7f7991d6ac4a6c9d4275b22f98c2145d3c0c1b286cbcc90b3c539e073380c0a
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 11116 bytes
SHA-256: 7ee665aaa5c0b4a8e334985ecf1cb5d652996a3360ba20beffe6a7bbce973af2
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1