Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ae8ac26aef67c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 23:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51a37b2f0730aca3813cc76aa44454f1 SHA-1: 174a12bdb02ff9a3b923a3685a7f6f20a29301da SHA-256: bb9ae8ac26aef67caad1d9d21efd7b114b7dcb72da9d2ce99f183c86842bc9b2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links appear to be part of a link farm designed to redirect users to potentially malicious content, as indicated by the 'utm_term' parameter suggesting a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=queen+of+the+damned+2002+full+movie+online PDF link annotation
    • https://isagrinio.gr/userfiles/notizulakipomogekuzirel.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/61888124921.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/tutatikuzofifuluturi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613003e7bc090---13335901460.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109181710462611.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/75737057229.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/lagakopowijofodisuto.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/91388350897.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/19259651301.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26e4f1eff---24574122622.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/gavedojoxuxarugi.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/dodevezejefikas.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/lomaxoxutapubigiken.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090808285712.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/20734981866.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/59502215958.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jekofukogun.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/1337972688.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161487eb2017af---1517143697.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/96025091151.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/ferejunenafozibovajinajo.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/tatip.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/62929344402.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/rikivenaxu.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/pupalukewusogozepidule.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 10820 bytes
SHA-256: 37a83ce1a151a6bd0380a3e0e47beb204588cf40ef67772712fd4b2b044164df
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 17076 bytes
SHA-256: 8aac2ba4b4ab82197bba25f45076364a9fad6738e8644f9928d817dbdc10147c

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