Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce19fb0c9e886e05…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 01:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49f2f05d5a4f5f5271a02b472d26b0bd SHA-1: cf2f6acfca17692d54f8ab33b194e7d8d1cd3dcb SHA-256: ce19fb0c9e886e0579b65e04fe397d27aa371690d75c1f28c7765e2b27ba9d8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised or disposable. The embedded URLs suggest a lure related to a 'spartan 300 workout pdf', likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://stellar.ru/ckfinder/userfiles/files/89279911496.pdf In PDF document text
    • http://seattledesis.com/fckeditor/file/mexis.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/10907443968.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210801024510.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/24228050618.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/gaxobosefujosoxutedamel.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/672a8012a31020bca9de0e2a8cb7962b/73751024865.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/56041368647.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7b7d6b1e---18858600663.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c639e23c73e---meganijenavekagududoga.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/40764420146.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/nu9qtvn5ebv2k4lfgnos8jmu26/88615387006.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/tibujuwusefi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161268de886cf3---95442506831.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78dd46825---62766555749.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/21435872590.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/67784051858.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1fb6916ed9dde3f55ac607e9cf4ba1df/toredemidone.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1656aeb5c67c8e25e1e3456fd3d63e6e/87616914231.pdfIn PDF document text
    • http://mamam.by/upload/File/file/47895393483.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16125683f6dd01---volitejekap.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/58451045864.pdfIn PDF document text
    • https://masihpt1.com/contents/files/bukasipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=spartan+300+workout+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_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 10700 bytes
SHA-256: 57d84b061c8d434f40d3d9653dd31d126fa2d26ae910e81bf4b17d1d3f717c7c
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16772 bytes
SHA-256: 2dfe864a7b566960950c6afc46cca914996c6f5e9c2d5752482250a2df652182
font_02_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1