Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54d772d903c8a8a…

MALICIOUS

PDF

74.3 KB Created: 2021-05-20 01:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203fa04af0ee739c7be733cf9875f907 SHA-1: 499cd9258d75f1e2295ea5753cc48e9a314e7689 SHA-256: b54d772d903c8a8a61f199ec93432ce50d77599a525d0a3e09fbf16ce50119d4
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and ML classifiers, and exhibits characteristics of a link farm. It contains numerous links pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8175

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531d6f0849---rofigelepaxex.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071d88fedb9f---52862019408.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087219e5af92---37124581615.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728ada85cf1---60004670497.pdf
    • https://aartipalette.com/userfiles/file/26444042228.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd11819537---71608212692.pdf
    • http://boothbayharborshipyard.com/userfiles/file/jotezu.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3155d352fd---83743933084.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160936cf663f77---39366066437.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b85366b6121c9e86eb7b9e392e75dd7d/19680446231.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160941d089c413---rijeru.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb22992f79---42667453792.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/99357676389.pdf
    • http://10glazsikeyrosa.ru/file/tofopuxufezotusolowuwap.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/n6vfrvoe3ov6gjqd8cf0btq049/lusitawelababorudufa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=taiko+web+custom+songs+download
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df07.bin
8349662d68287afda4a81b445a8f37ccefba1988e3cd5d86f5d515288967a83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 5288 bytes
font_01_sfnt_off0000f100.bin
939e98ec5a253ffefbf5181aa00182cac644689978f2f6d2fe560980b098889b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 16968 bytes

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