Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c1aba42673fbfe…

MALICIOUS

PDF

65.1 KB Created: 2021-09-05 04:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56473ca07eb357b78cec793330a33779 SHA-1: 5679bd9e24db696a3fd666ef3a6547301557f00b SHA-256: 97c1aba42673fbfe81b2d57db19c074b8996197f059e0e566b0ab362e25e424e
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, several of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8306

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://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/319a73ac95d3b34c725eb64db6a97bc7/25625769885.pdf In PDF document text
    • http://myarrahnu.com/mo_images/files/kuzubusow.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e7e9db5d4c8d1a94990934fe04c0e294/28179073786.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/38709607521.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/172e1373500b62e4ffa9e2b713003771/lilunigozijojeg.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/70538299004.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6302cb1292f8bb54bbed11ea039a97c5/gupurev.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/veturerowowilum.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/buvibezufikuzawobuzutap.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3973_20210628194551.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/85995969612.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aaf579d1656c73a7548610c6bbbf2264/mifulixupiborax.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210802204905.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210811234219.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/2007315283.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wijegotekagosevafawedorix.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wugorivamezofo.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/55483649652.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/99f6653ceba3afd22c61b04a5bb6798f/26548008625.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/foponojem.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/kd1kjeco6h0q8c6nn9b5hk800l/1118923001.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e46974763---nukuj.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/bagugubiwerepeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=2015+mustang+ecoboost+manual+vs+automaticPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 17936 bytes
SHA-256: 5c9dccac4c2786c7f67d41d0569308cf3fd4acd2646938a52b9606df355f7d8d

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