Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b4ca5895286dce…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 23:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4ff3670c4752cb5c9bc942d7f3e09af SHA-1: 041d2193bc3b72b9bdfe27bd24d83e2f01494f14 SHA-256: e9b4ca5895286dce925e28ea8e1702e07d2ef6d098b468f8cd77157081505161
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to lure users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=snakes+and+ladders+money+game PDF link annotation
    • https://netwindowvn.com/uploads/userfiles/file/11006672481.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/79614051399.pdfIn PDF document text
    • https://carlojans.com/cms/file/94328222846.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/bativivobex.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/89695815577.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/tefalamefi.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/52243519038.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/kizaroladebifojaxajabapun.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/fawebopeli.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/najawenutup.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb984c87ee---lonadiwufeb.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/vavudi.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74794730369.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ddd9dac6---59999299934.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/642a478e55bcd906af15bb79023480d9/kujakabisa.pdfIn PDF document text
    • http://ceroki.com/image/files/11978972081.pdfIn PDF document text
    • http://canadianrockies.info/files/file/66140425443.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210914182907.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfefb65b54---22499954216.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/basugoduzedi.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/gusegodalafilavade.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/zuxuzafumubakevibuxuzaj.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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 17080 bytes
SHA-256: 3e5f416a6666e4453f580622906f0b6d37c95d7a1bdc08a071ad762d248a5d51
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 10680 bytes
SHA-256: 6d0757e680bcc99ab581ec694e9391e41ae9a01e1d1704842c48b8fa8e17bfc6