Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f47677592dfc01…

MALICIOUS

PDF

77.1 KB Created: 2021-06-24 06:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 762883e191d8ae351f0403ff739b66a6 SHA-1: 6f536c5cc948cf79390beb63ec0958670e1a4094 SHA-256: 43f47677592dfc0134cacfe117a223fc2f5597f1428b0836eb0014d19507d3b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to various compromised websites, likely intended to redirect users to download unwanted software or further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of distributing links through a compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=shareit+apk+old+version
    • https://alice-immo.com/userfiles/file/muzusiladamujivubuvu.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/92fa52119b473ba7442751240039f914/muwapoxidakaforulojur.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/312e1f53252bad6c678c9834c637f808/4336575453.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faa71a7a06---55954251069.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3fdad24ca5d0b87f5b37718b7e0ef428/33964185960.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/133254512.pdf
    • http://libertyquad72.fr/userfiles/file/84629213111.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9bqab8h156filps5p2vjc9tk32/naxipolomaf.pdf
    • https://loctra.net/userfiles/file/fexalesenezilozororeb.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c22040be4bc---fobukobusorixavisugu.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a3gqheha3sgechc7ishuvpq9s3/lalakosidev.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7d1d202803803652d82f49f00b8c9233/gesev.pdf
    • http://anthonyvienna.com/sites/default/files/file/ziwekunavopivimur.pdf
    • http://atek-ent.com/upload/file/detuzogazubewubusavawub.pdf
    • http://wsystem.sk/userfiles/files/dizevipulure.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4b21c800e4e6ed33fafdf9e20edf2c43/mejusenonazizorakadatufo.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0b7c6bb7---bapebijosibajulewuxezonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb7.bin
7adef1f2d9de06a0c2bdad07a8a095c44f8af021eb00ee6392dc9ed24f146f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 3044 bytes
font_01_sfnt_off0000daa1.bin
d20579af8d11afff39affa358c5cfc7eb15eb86e71e97bc4d770e1db098a17cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 5272 bytes
font_02_sfnt_off0000ec88.bin
8740c6c0ef070503010f30a702b0c5d2b57d9b318f1badce877b8dd5e55c46be
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 10812 bytes
font_03_sfnt_off000111e7.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16204 bytes