Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e2a6f415bcfa93…

MALICIOUS

PDF

133.9 KB Created: 2021-09-08 12:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9959bbb2809bcaf18e6f2c421cd576f4 SHA-1: 4d9ed49c88cf7f975eaa988de256e0db0856b209 SHA-256: 05e2a6f415bcfa933293b35ef21b587cd57f2a3fd390f147a060787bb79d209a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://esangsok.com/upfile/files/21734993302.pdf In PDF document text
    • http://machin.kr/userData/board/file/77672470024.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/89250874144.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/fumelixusadiril.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/10692503712.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/53138131798.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/68423346182.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4l6v17aa4g10lk0nkq0akcebf7/20367675080.pdfIn PDF document text
    • http://gestioniarmatoriali.it/mamuregatete.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/5744561000.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16137100be8f30---rivuredivefiwanazotorovab.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/26679812023.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/41627075549.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/naxawesap.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/gijubipemofefupere.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/pawewagugu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/wagofeko.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/fogokigirexorekexamafoge.pdfIn PDF document text
    • http://hydrem.ru/images/file/divibuzokomubij.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1fd491da7540d7e498cc5c4a4000dbc0/razuxedafiz.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135117886e90---newudetizavanixizuti.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/16e4a41fbfe5e82b1b50ed025d7dadc8/lazexipogejoto.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/koratesadodane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=zagreb+travel+guide+pdfPDF 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_off00019f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F96 22808 bytes
SHA-256: 7cea16e30a24d95c6ff162a73f46bc85a2537d21c80271da3316ef9d91ac1b0b
font_01_sfnt_off0001da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA0E 10552 bytes
SHA-256: 1bce1b18924ef0c4ec0099f369527c5bf004e94a0446a214d60606630e8dea04
font_02_sfnt_off0001f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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