Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6ca0e1c728dd29…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 18:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 932f14b75531b9c08fa2f27f8e3d7b70 SHA-1: 66a56a726a37710b0212f62f255b1821a5775dbe SHA-256: 9f6ca0e1c728dd29be47083599ad82eccdb07c8e3e99289837b5b04478dd3ab1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to compromised websites, some of which are hosted on disposable domains or use WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/17f436222ffe2091b2a260fe179812ea/28138539415.pdf In PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/vizimabefukatikokelab.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34e607657---lotigarezaruximovi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/63k1uii1087gkc2eb5oc3pn4p1/xutalirulujak.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/25268148292.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cbc7cf2b3b42a17efe6ac1a4bf45c768/norotupuwinonunekili.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/30165666574.pdfIn PDF document text
    • https://tepihtrava.rs//files/zonasobitavadakipu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-17/20210617122625719063.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/56310718393.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/besat.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8e272f107---71382709954.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/36956504937.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d6acb041---28099232495.pdfIn PDF document text
    • http://pusulacampeyzaj.com/images/media/files/13591597990.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/6212151316.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/wawufisi.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/lumokawixe.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/347b9b8f2e52ff59c0ac061bca6aaf98/1666314072.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bb38bbde1---91237176206.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/300b36e55f705470e7160dfa8e13f28d/nudate.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/43051647706.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161060b947ed34---62661515004.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9f10c790c27a752ca7314fe7b38a1b96/27940687574.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/tufufonugijesazulizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gpu+pro+advanced+rendering+techniques+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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 11204 bytes
SHA-256: e296e0315eba7938bfd0a17f9b87138cc5ebc2b5a8a8d1e72e48eaf78c01870d
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 18616 bytes
SHA-256: 8334d4cf78774cd8c52858b09ee843babc3615802b21c674d74a4a3ab31df265
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1