Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88325a556eae2b8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 466424a96dcacfd6f46b4ae4b2cf90fd SHA-1: f2cd8a3b218209bffedb17bef039027b91a14fe8 SHA-256: b88325a556eae2b8cff212cf1ab2d0cd1ca8061e70d409c46e9127681fc296f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

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 http://eprdel.cz/userfiles/file/63266383081.pdf In PDF document text
    • http://deforma.it/userfiles/files/lowaguvodepedidoditot.pdfIn PDF document text
    • http://servmed.net/userfiles/file/89381488063.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/bikorixe.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/537a49af90a054d456fa6f64fb25a626/34975227625.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f580edb7481ea828242eb54493f5099d/zizabajavoxetetok.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/92447527118.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/98297937310.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/661fc86bdee9a43279f317a2bd4f7837/77352674913.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/n85peokaisnb4suhmcr56n89dp/sonedubekilejo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/buposemirisupusuja.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/6900363127.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7004rk80tr8k6mak5qknr2h4d7/kemuduxew.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6012031e---gagogegelajabe.pdfIn PDF document text
    • http://soupworld.de/upload/file/wewaxol.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/kujazijezafovijajipuwit.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/sisuzutafalese.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d38be32a---dodutojedelala.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ab050f9bfb5---sarunamibub.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/41194520613.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5629d8c1a---devumuv.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/naxakerozupifiberebe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fejukositixarakebupidepi.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/bijazixogaxosek.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/tegiwivotiwilisidikaburum.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e6cf29e11---91484114848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=culture+d%27amandier+au+maroc+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 20456 bytes
SHA-256: 49013ecd88bdfe06a67f1d01211b68f5299d1dad1c5e141e49bd378d03f3960c
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1