Malicious PDF — malware analysis report

Static analysis result for SHA-256 40219a980f0c6391…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 11:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 015ecdce839d87b79486aa0fe115b8c2 SHA-1: 0f7e77596a7c8050db8907f4b69787c2a32f7c7f SHA-256: 40219a980f0c6391f682e1b596348356666c2f0417399072adce918f03c9041d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7562

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 http://brixtontaxi.com/survey/userfiles/files/lumokovupikiz.pdf In PDF document text
    • http://trans-serwis.com/userfiles/file/xipejiwavaguwanol.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/htucdp8de0rh21hhj42274v0tr/zibuzipigogunero.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vanogoko.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pavuguxepow.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/juwimipafip.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/17226978450.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/54572124558.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tepitelipov.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/52397360295.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210815090541.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/luvozigivakuzakemugizu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulokugeminafakoge.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g94qok6tadqr87hrld3vtgce72/pajovapupeka.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6102FBFCDC5F6.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n5qnjc4udmqr8tfnkggpppde00/51846922563.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/161243182093.pdfIn PDF document text
    • http://inercial.es/uploads/files/levinamovusudedekebitul.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611999e3afb12---29100211437.pdfIn PDF document text
    • https://reniuved.it/file/29350837468.pdfIn PDF document text
    • http://nessium.net/userfiles/file/samedaduxa.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160709255f2cef---mitonenogirupofirumugu.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/74127209949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=anion+gap+aumentado+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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10608 bytes
SHA-256: 5959eeaf3a37ece03eb9ed700dc52fcb39163544d74cb66c9fd2d0b1046116e4
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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