Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf0480b6a7ea23c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-09 19:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 67e36f8c308ffca7900dfeb21333cdf7 SHA-1: c638cf8e867a9e32c4b5417209489bbe51bbbed3 SHA-256: abf0480b6a7ea23c386f1b6a27a57ff492af4c61004d03b90f2a31ea5cb699f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to disposable hosting and compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://thanuyentea.com/ckfinder/userfiles/files/65038132296.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/upis20q0emldsg2kk6ftl8k3gc/viferanekotanidukotopiwa.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/virafevaxigesijuzef.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6637ae850c88859d77a669d88d2a3d94/53982134783.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/8783904482.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a092a2f9fabf5791d307bac5f9356025/38560611358.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/zuneganikeja.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/pezimivuputusonevafir.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba003a60fee---31426821911.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/41320330522.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b31ee31a7---41196340111.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/somolusufanijinumuginav.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaee86be447---81480280225.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca3d6c8cf---59448896130.pdfIn PDF document text
    • https://aedwea.com/upload/foto/27865947939.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a047692fe70---12821154411.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3e996ece83606f90b24d1dcc7ee4e76a/govalo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fepagaxikememibe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66226ebabf---fofep.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c31bb2c9e24---xasofaxuxidovaberoz.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/4da98a894726bc93975a192dd261dc0f/defetag.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/wekizutosufunegejofewef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=no+mountable+file+systems+mac+catalinaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10728 bytes
SHA-256: d931e4dfa02d8b22b3066067dbbfaf2d03d533177770d93b1c319f534e9294fc
font_01_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 3288 bytes
SHA-256: c75fecc3a55cac33f9708e96dc8ab0997bfdbc7bf8f52509b6ad72b466fb06ab
font_02_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 18460 bytes
SHA-256: 749d5daab9277f8b9c7496f7811040610164f897bb72ab2daad12e2a6fb8f876

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