Malicious PDF — malware analysis report

Static analysis result for SHA-256 28556de9b91a37ea…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 08:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb689a9e596af99bb9d3bb4acefd428c SHA-1: e9bb7fae2d71194f2ebe9ba4f803dd63aa832e5c SHA-256: 28556de9b91a37ea7759e261a79e8b8b762aa40b5d6b46dff47821c0444efa7c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the heuristics confirm the presence of a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://tonere.shop/app/webroot/files/userfiles/files/25282074237.pdf In PDF document text
    • https://www.mds-horizons.com/upload/files/35339502824.pdfIn PDF document text
    • http://fittbikese.hu/files/file/19953092990.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/nuvovusebijumama.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/59550861248.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307eb8a297e---janumaxizakoxukasotuf.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/79639150153.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/tegekiz.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4123b3561---22179002748.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfeb1692a3---6714700019.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/towevotevuvatejenajebuwe.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/lonotemuzik.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/96353373071.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/viwolugufuzisogosuki.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/rowivowibuvuromex.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/43476476458.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/lovifomupakenot.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/5499816150.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vaxogaxidezitotujivowuku.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/felunuvanibimuwo.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/kikatapalovimasopiwivoduw.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/71139085638.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/56441081326.pdfIn PDF document text
    • https://datajournonepal.org/files/gekexowamupatumigisalow.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/29746967767.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/44964576621.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/sulejezaxunabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dragon+ball+gt+transformation+gba+romPDF 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_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 17480 bytes
SHA-256: 57b398ea5674b96c33be0874dc194b0c012681482df1d6527fc724972426329a
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10564 bytes
SHA-256: 287b35a698415e6d8a00d9c1d24cd971115fc2a982933808b0fcf8c09ef9d423

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