Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f7e42bb0834402…

MALICIOUS

PDF

119.4 KB Created: 2021-09-02 18:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07731980ac21677cf4749ef9c37bdf75 SHA-1: 6c95ab9b7eda5751a299cb439cbc221fdf42c756 SHA-256: 67f7e42bb08344022bc6f0b3d0994b060a62b91ab9933a24acac6056eface73f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3051

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/plp1vt1f93pd7caojdqs9p73ln/83761285072.pdf In PDF document text
    • https://didacostruzioni.it/userfiles/file/togeguba.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/53424975211.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zerogezeronizep.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160852382c4272---mikotapatobozuserirafefa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5bce92d39---dologejawiralowigufipureb.pdfIn PDF document text
    • https://granitnet.hu/editor_up/18902988078.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/12db9c18515b23d814779f77dcc1140a/jesel.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/74049243391.pdfIn PDF document text
    • https://senhewood.com/d/files/wewaverosakabuzod.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/siwarinavupegog.pdfIn PDF document text
    • https://alpinashop.bg/files/8225897191.pdfIn PDF document text
    • http://eko-uklid.com/files/file/51399470832.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/vifadukezemorosotuzabe.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093459dad39e---puwurozowidazi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e01f4c71d---nofigo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87c78682c---40506209264.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/97427807340.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/sibotutorukuwaxufe.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/dd3db3416becea06dfe49a2874963266/mokezof.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vazatofak.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/92212522714.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/73673856165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=marketing+strat%C3%A9gique+cours+complet+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17274 11448 bytes
SHA-256: 66774d41fb943e88ac39b13113d380c6a728781ccb32cc94c976fae7e297ceb2
font_01_sfnt_off00018cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4BE 16504 bytes
SHA-256: 215e8dbb0524c5e2e5d06b8657657eee9d6f193383c8189600904f23bd9b3429

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