Malicious PDF — malware analysis report

Static analysis result for SHA-256 02aa955421916fc0…

MALICIOUS

PDF

89.2 KB Created: 2021-09-14 13:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 810164372aec1b1fc9585f74dca6ddd8 SHA-1: 9b00328954893ad00a0ad3475fef7d3601bb1912 SHA-256: 02aa955421916fc0a78d5e412b8d45c0e65d2749a5ad805b63c9d85ff55954f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress upload directories. While no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest an intent to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e2f5b719222a310facb444c38f8030fe/pevikumewiwoniw.pdf In PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fazeguwapugapikasido.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagoxatikixu.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/66310981123.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sebesoboxovu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/60837602096.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/sebivala.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/24830124587.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/74157115780.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/kawikofas.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/37140469705.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/7952526728.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339940f2442---98898194807.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fopidumunin.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e092bae67---sosifajidulogopifixif.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/62371859033.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/30556995415.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jomigi.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/6834655831.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/70227008974.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/87978357047.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/14159893832.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/fudiwolafixasebam.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hps80jbg8ucodqig88nkf2oqj4/fudosufodosadaneretibibe.pdfIn PDF document text
    • https://epiphanych.com/images/file/88654343261.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908230304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=conditionals+0+1+2+3+exercises+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_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 11212 bytes
SHA-256: b80900b7a1db6e7a43ae37f7320b59e0798678f64444540daf3cdd272db22ae2
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 17844 bytes
SHA-256: 73a4058e45b895c09f8576c90bec23c6f6d9f6f474230d8b2b41a5a86c85ab83
font_02_sfnt_off00013ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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