Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3271da16f4c0922…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 20:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7954213dc72c5294774a934e9aa3e854 SHA-1: f7a0662907d3d711f0aab5e47fc3effb299a3ae2 SHA-256: d3271da16f4c0922b4443fc1dcd4db817063284d45dc7b23216c47371b09aa76
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 executing malicious code. It also features a large number of external links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://minhgianggroup.vn/upload/files/laxiferezoxifej.pdf In PDF document text
    • https://ganport.pl/userfiles/file/47636818857.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/favagizig.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/66427369881.pdfIn PDF document text
    • http://carbonelite.ru/file/48893631886.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/419060379.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/16309386360.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109041345021126.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/genudafatenevol.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/198fe59a92a796cb11ca0a2202254bd8/vepukonafaxubediduxute.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/90080782510.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134687c21b53---71754717708.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/73788033166.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/16826241390.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/6084000247.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21d09ddb3---titojogapise.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/gopitadovot.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/nusoveje.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/rujenusoxa.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/webujamivam.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912145412803164.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/98870242661.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/665483f60dfa195d7cad29a72eb9dbd9/vepafuxuzolawev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+free+robux+hack+2020PDF 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_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 10956 bytes
SHA-256: 758cb4439010c2ed433ddad1bb67990dad153d3b6c68829c3f14e2a97b5db41a
font_01_sfnt_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 17184 bytes
SHA-256: 22d1bec233bca1b508ccc3c5d037b181152593e52e7b6b351dd8be5e97963031

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