Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee9cc5d66e13e80…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 10:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81ea344f27123feb3a72d67d89bd659d SHA-1: f516556d9affc4ba57af332ec6b3ebe41a7c3af4 SHA-256: 3ee9cc5d66e13e80fe42ad087ac3160fcfe5582d038f7dab42b37e2209266ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://infrive.ru/uplcv?utm_term=how+to+do+a+screenshot+on+a+galaxy+phone PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614978d92460d---21113144068.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1face1854babf07590077621dd68415/48997184786.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b791e768bf---92800683900.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/69006235168.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/2147025295.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-23/20210923024936421720.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/koruremoboguvi.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/35079098940.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/lazajixamedibokor.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/69525901281.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/zujotanatenesunixivu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613581c08bc2d---zujepinojokezam.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/titetulalixolibevibut.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/1948637023.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302231636a7---xuzojezuteneg.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ad768bbdf3325eb73b523800ec913219/zogipuwobatunamekur.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/pezujobofakebor.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/13780725919.pdfIn PDF document text
    • http://medi-sen.com/files/files/remixakizexosivulaw.pdfIn PDF document text
    • http://okvin.org/userfiles/file/wewidafepovomopido.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/98013174137.pdfIn PDF document text
    • 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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 17820 bytes
SHA-256: c21946e0c96fe97e4d1d90bfad3d5a4043607dcaeea371b6f29120175c31e1c2
font_02_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 10992 bytes
SHA-256: 0ebdfa3f1324f4a2889060a2070bcaf95cf217b980dab26bb26e762dffbabc51