Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bf6f0d33672541…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 03:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5563686556be64140d0d1b74beab3fc6 SHA-1: ca035a971a06024b3ce65bcf9e3040792059a244 SHA-256: 51bf6f0d33672541740ba0b739205fe85d29c2031290d465fe2dc9fe054fea36
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The presence of these links suggests an attempt to lure users to malicious or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6693

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://amadpich.com/userfiles/file/finosem.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/4352356016.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/35fadf7e22f545943f3f6b4ee2fc32fb/92253535164.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609661e6493c2---39631282167.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/14ea3f396d2ff7389c9e64ce34345439/56431659303.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/guwevaboderalupogewe.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5a13c50a---90209730579.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/gujeduz.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16128f2f2b2926---muwagiw.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/697ed9a5e87627b3d7f312e870dea0c2/lobofuvajajejazexafog.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/117551cb1881ff47ac1b033728b3c354/roxagixoforunafotij.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1644da4d2---28810647114.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fddcc026ac7308fd5798e7cf65c330d8/basitivetuwenuba.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e74dc6535---47016706537.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/1067840203.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/jozosa.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kuvuxuwa.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aratexazotex.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/983a2f17d93a461c63219cc0873b197f/14165689556.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/93875209992.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/99a3ba2a997918a07ccbf186c31bc42a/fonawutovo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b3a8b035---nesivideg.pdfIn PDF document text
    • https://zagi.hr/files/72475145977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=delete+some+pages+in+pdf+onlinePDF 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_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 10744 bytes
SHA-256: f6a56be151af96444a05aeb3341ba2405c558be6d3af870f2c07d142deec9d48

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