Malicious PDF — malware analysis report

Static analysis result for SHA-256 4259f62420d34d9a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 21:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 865af2812989aab489856be63ad9cd02 SHA-1: 63b165d2248cac78731aabc164a638441ea0dcdf SHA-256: 4259f62420d34d9a69273dec7bc9d3a67931a05e3cf8c19cbda913c3d6369ac1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://royalgroup.at/tmp/96978361716.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/46834cb0c998dff85d4d11c34246db2b/mimiriderekalovepo.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/ruxomabo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/de0fc4cd69661dc6a7953e285b0ec7ab/jareluwo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4be35a737af389a075ee2b74ed787fdc/99237097723.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/34777940029.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea9ed3986---87523400711.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/39f31fb52fcb600dafa384242950dcc1/karoboponinibomosa.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/47095869235.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/duvasupegikowakozomajab.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/firob.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/nibopuzasikowexudajiva.pdfIn PDF document text
    • http://elma1.ru/!upload/files/54776379870.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1b7ce1ea42eef28bb4cf743a9a18b295/zafezolato.pdfIn PDF document text
    • http://www.bash.cl/media/file/nukatomowonof.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcbbb236fc---23755943920.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xasidojelewemukemerudisab.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/pisagumujimedifujuj.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ho589ubhh7et8hc4ffms0kuq6t/72147023683.pdfIn PDF document text
    • http://hainfelderteich.at/dulubokowitipej.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/dbc8f02f6a4e95d0f3faed88c5852e85/65518382155.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40947375386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beta+gamma+function+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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 20796 bytes
SHA-256: 850faffb0983d9f637cfa8ef9def631948c205d9b48676c944f2490c0a742ee5
font_01_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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