Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed4cf9a903f8025…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 02:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c86e02ee20bc1748934ef7d59b5da29b SHA-1: d10ba996a6869962befd03672fd8ae851ae10865 SHA-256: 1ed4cf9a903f80252464422fb9176a3645a3d18f8a863ba62f3d58d44e597ca2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://millvalley.com/wysiwygfiles/file/26882370060.pdf In PDF document text
    • http://roycraft.ca/userfiles/file/56542274206.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/zemekebidilabenazifekifa.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/90520830362.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/tubudikukepilasorivo.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/19948489587.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466dfbcfd9e---bagasofegibobubobe.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/9789106243.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/54493404659.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/fabaxawuxapedewitowupu.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/73145276029.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/80968552732.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465f69745f3---jakim.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/65043078140.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cn1v520qvd44p5o4urf2qjn2me/xisifajovikinowoxex.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/34332661177.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/xizadijibewolovab.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zumejataropaxomupezabupud.pdfIn PDF document text
    • http://ombs.ru/uploads/files/78478539300.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/33216697306.pdfIn PDF document text
    • http://contextuae.com/resimler/files/50996725700.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/19266991641.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/zojixidatikifivojepotowo.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/lekiderapawoxisavoxejuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+unblock+a+number+on+samsung+galaxy+s3PDF 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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 11276 bytes
SHA-256: 6bfa12a6eaba105514b6855ee155c566b54dc6f6fdbbbb6bb8eb28e9f3c2af3f
font_01_sfnt_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 15860 bytes
SHA-256: 46df7f261403b7ae683966fa13380933ec34404e69d0e5e48f09542b4d39a313