Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ebdfc8e54da7d0…

MALICIOUS

PDF

90.1 KB Created: 2021-08-05 21:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d550ada754cb61eb127930f2852a5a8a SHA-1: 7de9e37e48778c034bc792dc33e34bece13332dd SHA-256: 41ebdfc8e54da7d0c33045d5f4ba7ad2565a59935ada2d3b26417b029a16977d
164 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of numerous external links, some hosted on compromised CMS platforms. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a deceptive call-to-action within the document body, aiming to trick users into downloading a payload. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=english+grammar+pdf+notes+download PDF link annotation
    • http://quiltingacademy.info/fckeditor/userfiles/file/resekerobuzevo.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/2173424681.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/63957282025.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/jinigimivera.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/hvot2fa5r41l48jd1sq2iovd86/2731768519.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/14458702284.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/50008423318.pdfIn PDF document text
    • https://bselink.com/userfiles/file/36664319630.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/81122385799.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/dojafujudonok.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m0aqeeiarjc3kc6fko6tkqonf5/gatudunat.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/sidutulaf.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/litizuju.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/1680308006.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/17lkim5894cku88rvcv7eohi4t/16230751774.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2c560a8e5037e9aef3cbe796a47a5ae8/87105552257.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de70f64a0d6---20797145248.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4tlrmnoouqmd6g1pbl1oklj3h6/45354789586.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/ziwijuzaw.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/vajatenobozekax.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 18456 bytes
SHA-256: 4247e7fb94522975dd4aa9bd7101feeda28693e87c4a4f3349f9e63c5cde9cc3
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 11012 bytes
SHA-256: 63e2d79fcf36492bac47f2a78ad3a53f40e3f7f615593357884cdfcb814401dc
font_03_sfnt_off0001426f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426F 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3

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