Malicious PDF — malware analysis report

Static analysis result for SHA-256 3650c195eadab56e…

MALICIOUS

PDF

77.7 KB Created: 2021-10-05 07:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06109a6f9d022d048f552a53399501d4 SHA-1: d85fad4c58411b009e121c5867b55c989c0d6d51 SHA-256: 3650c195eadab56e94b59a61d87f747b49c936775c0fa1514f57136abc1b84ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • 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 https://bonvoyageindia.in/ckfinder/userfiles/files/tesoto.pdf In PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/disakuwazaresizavomuxes.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161311867abf97---12310316836.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1ae5fddb020f3ee245d7ca1991c48a38/74265399622.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/42336701023.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/14914615993.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/nidafimajoj.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/lutusetapopajev.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/27494671276.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/pevunaxi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cb65ef49---95542341037.pdfIn PDF document text
    • http://mylead.mandiricareer.net/contents/files/97032029629.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/26559110907.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/vigijozunukesu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158067ea00ce.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/gepelogotiminefefa.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/sojidisiwazujorafolinogat.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/42511338933.pdfIn PDF document text
    • https://equinox-e.com/upload/files/xavatalupagukidukawop.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210923_022713.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/widijofesewadal.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/29414317162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+turn+a+mixed+fraction+into+an+improperPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 10848 bytes
SHA-256: 21e1c04932466e2108cf39a75b79f36c70b3d96aa7a3787a38f498625a3e6b0f
font_01_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 17952 bytes
SHA-256: 1191e623c9122cfbe429b9839b2552dbf7c448ab1948ec8195a319ff8da0f99c