Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a46f082fc340b1b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 00:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d5e21db22ad5ea35df62ea838132fd7e SHA-1: 3069b3919b77d0a3b608a16dea96dad5d77233dd SHA-256: 7a46f082fc340b1b98c4826359ec905839da4b2df8f31be25a185aab70e5bd62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically identifying it as a phishing trojan. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ktcyy.com/ckfinder/userfiles/files/68189748755.pdf In PDF document text
    • http://kor-ra.ru/UserFiles/file/70754984166.pdfIn PDF document text
    • http://brlairport.com/images/file/tulame.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/38148058994.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fasumalodumorezaxorumir.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xofugab.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/95512479429.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/suzofuzulanomonetapojapu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/lobotimawuno.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-20/20210920111256317519.pdfIn PDF document text
    • https://krusomying.com/data/file/soxobuluzojopofiji.pdfIn PDF document text
    • https://bak.vn/upload/files/pagabel.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/95418981001.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/76ef83586551627ca22e74821ed7be7e/jijorap.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/91869617880.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/25020247800.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/qo2hec6m0j263q9ebpoimqfuc5itc33v/55176381343.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ae8f5b70196d194ff38d456c0f320a05/73839490257.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/33282886359.pdfIn PDF document text
    • https://kimcert.net/E/file/lisijaj.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/48187983695.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/96378094356.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/tepapinudag.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/76207510845.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/tagamujerazobebogizi.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/nonariropugejopa.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/15377656324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=c%2B%2B+summary+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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 10312 bytes
SHA-256: 80c93d941102f41a58404af03f7570a36c57f53eb60bef6bcbc701e9bf00f560
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 17192 bytes
SHA-256: f3ee213cea72cd2fb8b32b9732f61390b3fb40627e0221c7f7021cdf90bf6702

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