Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1692e66759fc486…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 23:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a50591d32913104d122e72b09fe93863 SHA-1: 44150da8b6240097d34247693c79837f6d117003 SHA-256: e1692e66759fc486eea01654e22eb4f1fa84758703cff63275579855f3d03c16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm suggests it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=integrate+youtube+in+android+app PDF link annotation
    • http://loveperfectionschool.com/upload/file/bileguwuxi.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/zefimiwur.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/suzikujajiredijugux.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/mamoraxazeparisifeket.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210914002151_ohs274.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/wugokopelexik.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bcc9e53fe7f5d7719f30137236e466be/89729339121.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/retawavixozupusiguxobevot.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b570c8775710c0d35b4dc64aea6e5f2f/nemekikabowerikug.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/67773306270.pdfIn PDF document text
    • http://innotack.com/userfiles/files/93391733743.pdfIn PDF document text
    • http://minipit.com/data/files/34810949278.pdfIn PDF document text
    • https://taperagi.com/contents/files/91481877463.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/papagiruritutupuw.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e59d01268f12ec547e39ca310004a568/95430532042.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/tunizedubabixuvufoluwok.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/gojejedelababoram.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/65291d326b1f8967e58965d23e2c39b2/dumirulipuwegirurezil.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613743542542d---sesaxajix.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa7612f92---28870564789.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614064b82c318---bumalekizedupu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4059c7cdd8daed2751d0f5442a4ddbbd/zozagebumabakimaw.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/nefabelinalotuvuxuxum.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/68245026097.pdfIn PDF document text
    • 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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 10660 bytes
SHA-256: d322b9db7c6c26f395b59568518c31f82142a9af4da66c356ab4bf228d7127bc
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 17276 bytes
SHA-256: 6ba8be8b7afec8e13fd87267f94688eb7b3860058651342d5dd9aa8f994a7ea2

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