Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe46bee8b824c49e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 14:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42e6e2991048df132a789568a6f1f735 SHA-1: f145dcd1f2bed9d681f284e7427c209c1d0bc53e SHA-256: fe46bee8b824c49e96895e749a83c5472ffe3896a0dec63a6e9abd6b62487309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external links were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=best+tycoon+games+on+android PDF link annotation
    • http://ecohouse-lab.de/userfiles/file/75285522284.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/9314471924.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210925115457.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/17168901559.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/32597519105.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/48217929645.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kenubutonefedo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/90815427340.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/tokawonuwunalazozud.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/gopineputasofezuw.pdfIn PDF document text
    • http://kes.org/upload/editor/files/59044579459.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/5672510342.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/nuguzemasitidukiwukemefar.pdfIn PDF document text
    • http://skia22.ru/pic/file/69724609677.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/45172621425.pdfIn PDF document text
    • http://llux.vn/uploads/files/65019795719.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f00c873bf7c67d5b4e96d31072a9c017/xazabisagiwixabukusob.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/navubejopafawipiwiwuzadit.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/32204006225.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/74081577612.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee6c99550---29044111168.pdfIn PDF document text
    • http://banquat.com/userfiles/files/pixegomunipi.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/voxitavuwalekoxipod.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7fabcd42d391887e05207b917dfc57f9/xumagemiko.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/nulovumidonuva.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_off0000aff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF6 10836 bytes
SHA-256: eb7507312b52be40262c3c16554a6e4c5b820c1f05fcfbe7a581d0699c86299e
font_01_sfnt_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 15268 bytes
SHA-256: 5beb43018c22d5eb31beb0b8bc852c9eaa7a3613f9a0deff897e23049b99603e