Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ba9e7c3eed2fd1…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 21:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b100b6488fb42db3c256ee7684358376 SHA-1: 6099c247e3079cbcc596dbffdde39f8f55b8c6db SHA-256: c0ba9e7c3eed2fd1b2c42d9babb2c065b6d53daaae0e6c39ee9f0ba057c7d621
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest it is used as a lure to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://minhledtran.com/luutru/files/gujonifexavuxetikak.pdf In PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/lenapok.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/20506390504.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/febusijatexabimemirame.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/sm5irfunl3a7rkit84g8jq1nn3/nofimepubowakinazavus.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23294654373.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/lezaxoxovegotujobej.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cde3aca96d1---1480908017.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/40b831a699ed05b13a07d63769a88402/2320976230.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a4676108---dunamisorupelozadepoxuka.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/svk6issf05oto870uck1i2jku9/mogajenaxefa.pdfIn PDF document text
    • https://t2sc.me/userfiles/345619349.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/togunalixawalom.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/juwivalijibisonebo.pdfIn PDF document text
    • http://gabortech.com/admin/file/16497935339.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c002ab1982b---degilejetorojozinax.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0e442ecc3713b55e114ea01fd575b068/bojidef.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/xijilitudiwujopiluvufefuw.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/63338002313.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/pcs6i43icbbklgk33o6dpr61f4/45425774953.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/lt975g4h7qtejel5d3ht195cbg/5493186499.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/396428f5cd4d6cea2e12b20f3f875256/2001091809.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d060a39c991fb74d32f5600b63c7b720/85594845400.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/sarofe.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qdcpo6577brp5bkk0oeg5moucj/88506896644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=michel+foucault+archeology+of+knowledgePDF 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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10972 bytes
SHA-256: 6cc415ec2f611265fd45b23288bc5bf7bcfeb54137e5459ece8a19f52904884b
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 18652 bytes
SHA-256: ad3a479df8dae80787b58730e551efd33448d504ede95be5da5bc7dcdedf56ef
font_02_sfnt_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1