Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cb5c516b8fddfd…

MALICIOUS

PDF

93.5 KB Created: 2021-07-31 23:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f7e727010477e4851788c030871a0fd SHA-1: 0f62bf6a98b467fa0687bfd36d236e6023965e07 SHA-256: e2cb5c516b8fddfd2d921926620c7b1a81fdfde85d1c848c05bbc89147f64389
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, including one hosted on a compromised WordPress upload directory. This suggests the document is designed to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://kaowei.tw/image/files/20210705_021549.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k4q4k0b7041esmkig81cbhdnuo/141646895.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/guwevewunuxokusameb.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xiruxukuvuzefeneri.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/devir.pdfIn PDF document text
    • https://baptistfriends.org/media/fatudatopiwid.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/sovuvejo.pdfIn PDF document text
    • http://benrassam.com/uploads/files/24275460312.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/48810733156.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef68044fb---dagofip.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/sipopokapoto.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kfhpavfg9uhp2fi7lcrridc1j4/24741801806.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/tifedogigegu.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210718141300.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/vudodudimofomusadutexidi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/e9g378qkh0ml4uk3vr6ahumv5h/lofesalabuzovurotibaf.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4c56290e9e---85405054068.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uklgg3ac3mnrh3mbnp09n9vip4/89718689732.pdfIn PDF document text
    • https://bursac.net/userfiles/file/noxepesezelusudopaba.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/100a304a865b1166f5baaafd2ae7fd03/jememiditow.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/xobekazusofebul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=throne+of+eldraine+the+wildered+quest+audiobookPDF 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_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 16960 bytes
SHA-256: 62e79707311add786428697065a4ad56572f8b20fe3e4a57837052598bbc6653
font_01_sfnt_off00013676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 10980 bytes
SHA-256: 1919f82bcf93d59ef15366d8752fa7969c8d064fc1d02c4c417bd0430616a367

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