Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a9bf08e66366e1…

MALICIOUS

PDF

91.3 KB Created: 2021-08-15 03:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1120247275626164ef9cb18c60ab69f SHA-1: bf73f42340216c89896703d240509bb3269a432e SHA-256: 27a9bf08e66366e106e199926cf518a819e5fc0efda13a0f7e95cdcc163ed7e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute further malicious content or phish for information. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://ifaistos.reality.gr/~triantaf/images/file/sovagenavagetemelisa.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21aebd0fcbd1819837688e157a2a4084/mivilezituxuvugize.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624063704.pdfIn PDF document text
    • https://ridersshop.it/file/55966763898.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/dijolafasilevopax.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160883a019b4fb---xuzixe.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/19819575055.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/41273299015.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b490b749116---dawelegexapumokokoguv.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/fuzimozedepajekalaxomeb.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/45611713157.pdfIn PDF document text
    • http://jcpingie.be/public/files/baxudugafuxo.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210727055616.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47fd603330---rudemifonewifo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/kixepemowiwivatox.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/81974825931.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/91331072164.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441475a0e---pamemuxugepelab.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/756f4b1e7b3e5f8bb05769ff5e1526c4/52766525378.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a04c76b50---tipetigi.pdfIn PDF document text
    • https://tantecoccole016.it/file/83853641708.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/7831503609.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dc7966121---bokuzezizodiligusuzewenej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mechanics+of+materials+10th+edition+pdf+free+downloadPDF 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_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 17116 bytes
SHA-256: 9bd0c6fe2b37f676d24eb46070c077ac8d28fe85ce172622ce8dce940ca85f27
font_01_sfnt_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 11136 bytes
SHA-256: fb3cd6fcc0f6d7df275bc859ac3a4ea475c369ecf018768cb4b6ab27e5b68735
font_02_sfnt_off0001472a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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