Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f3eba941dfeba3…

MALICIOUS

PDF

71.6 KB Created: 2021-07-10 03:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c1886461b105460316ea5e17098948b SHA-1: 4d748bd8e6c463c6723d55a43e616c07c7536117 SHA-256: 95f3eba941dfeba386ac9b2621b1f8cb57ac79dda66c199eebbc414451d866bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

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://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/51752239723.pdf In PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/pedoluvelaraxivumid.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/tademe.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/634f52d487ef21daa188187ce084d946/ropeponejowukugukup.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bace053e---55685007257.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33f08609a---55396664396.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1bea2e9c---59369504695.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/81226293553.pdfIn PDF document text
    • https://loctra.net/userfiles/file/gebugujisadaxeparaga.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af6453409c2---64576454805.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22829341099.pdfIn PDF document text
    • http://mousike.it/img_ins/files/xadufatagu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc73b34a43---39755654602.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/99338290547.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b90f8e8d9242189d0488ee5494917ad7/70450554151.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/magavobederobasok.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/21327659200.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f955af3eab4d96f6bef248762e3c2bc9/66760982622.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160813bc77cdd9---vomeginuwatodoluliduva.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/e66fufs37n2u5phsibf25ljckr/lotolirololatabuxi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3ec16b50---dagurademidabir.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711651777d7---ruwakutavosut.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/vaweveku.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/mujowev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=earth+science+final+exam+pdfPDF 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_off0000b8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 10852 bytes
SHA-256: 28fe87cff677775e01d7c955d9bc33be6d3fb6bdaace6b6c9eb63f547e7faf89
font_02_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 15500 bytes
SHA-256: a9d4f4721bc06bac352cb4a4f76a044e9d8e43ebe8ec78c174f92f0e8610ef43