Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54e59830e160ad4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 13:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4e5d764b46f449040ad35989d4b4152a SHA-1: 6f07f046d025662a53b40f2074e574b99d3be08f SHA-256: d54e59830e160ad41eb720bb78efd5ce23aaf854e7e466c9adca5e60d1c6ee1b
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 WordPress sites or use disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.ksmt.edu.np/assets/ckfinder/userfiles/files/20126397234.pdf In PDF document text
    • http://vizit-k.net/uploads/editor/files/64283570225.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/83064253326.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/zisozubun.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/jukarugazubulomidedebor.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/teforokowujuwise.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/veturigitu.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/79512081063.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/20437385282.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/jamarujona.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161376b5723cb1---24807592242.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///kiviviwifi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zogivujomaw.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374cb16515b---muxovogo.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/dovegumalu.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/tidifezogalikizanuzusaw.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/nawiriromudo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/29cfae36b2ca8455ded56e60fe810673/zizesujevedutoputiworero.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/70386687989.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/65894662506.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/84714699941.pdfIn PDF document text
    • http://kelvista.lt/images/files/66393977933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=private+viewer+appPDF 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_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 9960 bytes
SHA-256: 34cf9e3262e8c282c66a0cb46020cc6642ab67b12a3eacc555404f1d46b04de1
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 17396 bytes
SHA-256: ef547be9fff4d773bd5f123aa8656fc34d1f2a69a85c01d39db1bd7e684c4c03
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1