Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf83ce8280714e42…

MALICIOUS

PDF

69.4 KB Created: 2021-04-29 08:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5230d14c84a5ee2e9eaab855f1324a5 SHA-1: a967a9c7c55068fdb4c4cc6a8d2bc9ab379a7494 SHA-256: bf83ce8280714e4292961b3b5923f3d13da8e88aff05529bc175a59bea4ed3d8
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'bachelor thesis template doc', indicating a lure to trick users into visiting these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8036

Heuristics 5

  • 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
  • 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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087851b205b9---60696816223.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736bc475b53---modibagufevixumari.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0ee2fa74032066c5fe0dae32ca356f75/50283742202.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e17c2ffae---luridukarexasojirevo.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5resuo0f437gdg1k4tslft9u04/46376616067.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d49dd30d97af2ace2061169bfac427cc/94529535216.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaaa57eeb---wabidakavilazepowu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a30e6b9f3---45767163608.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/849569a17a51c75d461f116ee078dc76/wejegumerizodulosaga.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6495227ae---52219295155.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3605fdee---papinagarimuxijajol.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kudusidizi.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a0afc5e69729ce916c4575fe3d489072/zinifunari.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a426568e7---61375077333.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bachelor+thesis+template+doc
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fa.bin
96650f8a726202bb9baaeaa5bf53b28edede0cdadf564ebee97a0fa79597526e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5360 bytes
font_01_sfnt_off0000f306.bin
0c87a77bf73cfbde69c1630c94e86766e61d709e5fcbb9370835d9ac89357148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10804 bytes

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