Malicious PDF — malware analysis report

Static analysis result for SHA-256 10600cf131d0e01e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 11:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d04590c5ced86247e862c464d50b0f0 SHA-1: 4f8404e4e68ea97e8837439a5617d890a91f84af SHA-256: 10600cf131d0e01ea4164ac2a88b657807edafad364e5f4e6ad1609a2f7de8fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7118

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://bompentax.com/quangbasanpham/app/webroot/upload/image/files/lisabimu.pdf In PDF document text
    • https://samsunyapi.com/userfiles/files/67270255772.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/9075095938.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138721fd6c24---89649702143.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/pizivuxetep.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bfcf3dc6c---wubojezosekat.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/bebalupuxebelanifigonigi.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/64210109891.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/zebagumuxidiwazomisek.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2f0c2d5a06c03f92708583347cd086fb/bazumuminofenajota.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nutumaxonasedaladavusem.pdfIn PDF document text
    • http://orem.mn/uploads/files/63189241180.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/namadox.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/sipite.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/82233061880.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131595fe62da---84900953847.pdfIn PDF document text
    • https://nexapos.com/upload/files/49948857243.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/77640600729.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tusepeviterarerenubenokip.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904035349.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/60263198045.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161445340f086c---10363696406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fastlike+app+downloadPDF 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_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10440 bytes
SHA-256: 498ea43455a86eeb760f5faa80adae795bb110d16a23a2227f33eef35b3a482d

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