Malicious PDF — malware analysis report

Static analysis result for SHA-256 e172e69e4da61b83…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 03:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ae4ec49e2ac4c1d9022dc780ea502b5 SHA-1: e0bee621f7a801291d0e33443281f4622ee1484f SHA-256: e172e69e4da61b83ba5a07c369e55ad739b0fe004bd25c872a17d30d193d2c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of external URIs and link farms suggests the document is designed to redirect users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://medvor.ru/uplcv?utm_term=phimosus+infuscatus+pdf PDF link annotation
    • http://www.dereformasenalicante.com/archivos/files/zowamoferir.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/46653432559.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160934cb7a2b1d---revenisodabis.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/84132199072.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/86388690278.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c3e58458d---dutipuxawalo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed86e0fbe7---74931527749.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/gaxokaxazux.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/96b834c81e4b270ccb5fb21ab7b571d0/94159435506.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/wakavijudizeka.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/35ea7f5756ae7cc004b95859830cdb8f/93217317202.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2902e588---pemakegodesanifixa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611efd53e2fbc---mimakizufo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cad79856---nawuwutupafozebi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b4bc2aea---93961342847.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/49ad0400711af6bcdd7f1015d71f9682/65364881688.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/78184549371.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/37294567226.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/loxawejiwakaferuvu.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/rixovumupozirewimagetiwam.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/67240786592.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/l6ouqjaga7v3gb75tgurbb9lj1/15739880014.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_off0000c894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 18516 bytes
SHA-256: d0d636879f27346b529181e9397e6d48048e22df41435b6484827f09f7b9cc3c
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 10708 bytes
SHA-256: f73339846a485c14e5400ac4e953862a87de6cd1081f717a7dc358edf419fea2

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