Malicious PDF — malware analysis report

Static analysis result for SHA-256 96271dac896d56bf…

MALICIOUS

PDF

73.6 KB Created: 2021-08-31 22:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2183b682394a723ab56528241e334953 SHA-1: 6a1ac25f6b7b1bf31e69e2a8f7b785be8b4ef2a0 SHA-256: 96271dac896d56bf6cb93481911b44ad34f922def7be90b791fc40a9b940ef44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cqk0unk56ujtchjjfn4m6qgo2/namixiwamekegopobesesu.pdf
    • https://nenmongdangquang.com/upload/files/55599040313.pdf
    • https://living-stone.lu/userfiles/files/vujuwifiletiwazugaxov.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/munutededixobisade.pdf
    • http://3q1p.com/upload/file/210722085401000627mniw3l3cdu38.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8efd274d5---34067455151.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2750577dc---milunijuwi.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3c10486e---likuzivexekuxibofofi.pdf
    • http://risorsaterra.it/userfiles/files/86323394936.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/33584769942.pdf
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/xulagekimixewemepunevi.pdf
    • https://alatheir.com/atheirwsfiles/file/53507464969.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54528ae317---wulama.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/mewojifojopirubirigopup.pdf
    • https://aspirans.com/files/file/vumutasuvape.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfaa0b10a1---944718045.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab9daa7e3---gubuw.pdf
    • http://vistobrasil.net/uploads/file/57344865001.pdf
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/gigamagasamakowebirewe.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/zirowikimevasitijokekuwe.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-14/20210514084903929086.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m816hdugg8dl72lrrpc61355ao/begiba.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e774d03dc25---86652956070.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/kigakebekotoni.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079261d99afa---pupozuvo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=marriage+lines+on+right+hand
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c29e.bin
81858e154d1f2bcdd7a7622efd1f4b1445d1c7007367f690ad24b104e5908134
pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 10520 bytes
font_01_sfnt_off0000da48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16792 bytes
font_02_sfnt_off0000f25a.bin
ebb9fbfeca920ac56004cf03092c8382e733f16f01339b4a970d75b61126e1ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 14912 bytes