Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68a1b4a1ce1645b…

MALICIOUS

PDF

62.6 KB Created: 2021-05-22 18:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 544dc046dfbc0c042130216e9569f69c SHA-1: 0c53c66794e2983df9422fddb312b74c1e04c43b SHA-256: b68a1b4a1ce1645bb02e59f43a31bef6e7bc8e0d07b0e91b8d9b3b5596672477
154 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous links to potentially malicious PDFs hosted on compromised sites points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8574

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d21001d84---xatikusosa.pdf
    • http://szao-spb.ru/images/news/file/22721072728.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7fd830ec---tevod.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075da60ca752---12822821501.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5bd35847---7885097269.pdf
    • http://boursemoi.com/userfiles/file/37060736077.pdf
    • http://humanitool.ru/userfiles/file/48167602868.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160886c29c5afe---ludewoguzovitax.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f7d1dbd12f98147e33bfb06490a47710/safebidemonazedag.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c5e0e455c7da930204476061919b3025/rajesan.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3810790fbb8457484521c7f23f5abb76/53762738104.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/44fb16111c5b8fd1066fc8de91ed8a28/90136629487.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/928cc2798398836246ea2d6e63d7ff70/96460765717.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4231576bd3cb1efbfb352c43830fda41/juvigesizal.pdf
    • http://acecaalcoy.com/userfiles/file/kikamag.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848f4a46b44---1117803862.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/5736156c1c8855220d189849e2a1fc68/gijibuzatifatabalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+pair+bluedio+hurricane+headphones
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44a.bin
9bcf8b3185b64f76d46863aa1547bee1da1437bedfd31b1cd40f6ffe6517891d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 5236 bytes

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