Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b1eebcc7562a28…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55f0a2a788a14bb8afc802fc5e75090e SHA-1: e711ee5e774fb71ed5d1843d50f16181f7d22061 SHA-256: 96b1eebcc7562a28ec9edc986ba01dfe2e874155791b40c5e9eb610f15e6b800
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=how+to+write+research+problem+in+research+proposal PDF link annotation
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/jisidozejetofupadotugavij.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/21120275427.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/eebbef2ad6889ebba33c72aca8910dc2/wubij.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/seqgamfddapg5f4r980bif0b9s/18475439561.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/xiwepifusilorogozuju.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/73335034060.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb250c0b3e---74258358316.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072013193973499.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bb7cdbcf034528e424d845430937d986/69227757510.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8c725be7---vupupobutaledexowosijev.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60e4aeb61b---83756304228.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/70194057900.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7196984fae1d5ef18c8b840467de7c40/17382033311.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/35415445705.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95716bede---46705777598.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/95072377852.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210818012957.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f462b3b1a0---82228489199.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/fepukovogaw.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/32083432450.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/9945036853f7bbc990dc0edf9ec836d1/40197804242.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/96224965846.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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 18652 bytes
SHA-256: a97f2d3dbfcd3a71dfa0c327fd0445c3e17574e40ea9cc8fdacd757823bf48e2
font_02_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 10856 bytes
SHA-256: 3aa9f35862d1975756acf8e528023315d43688beb90b47f32480d2d83aa16a76

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