Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4780f06abaa39cf…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 19:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d55d0ff3ff8dc11c971dae34cb86ed64 SHA-1: 822d3cef7749df374b35242a7daaf1b7e1de6c71 SHA-256: e4780f06abaa39cf7173b9d91a382d9810d9ad20072b3d0bac7bc90ef622098e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded JavaScript and linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=minecraft+mobestiary+free+download PDF link annotation
    • https://thegioibaobicarton.com/Images_upload/files/53987619811.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109171211511495.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/80322541980.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/63945389479.pdfIn PDF document text
    • http://partnercable.com/files/84732011036.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/18879023688.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/163101562199003661.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/54804984618.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/jipofapusa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/cfb1cdccc0acfe4da2f65e78f668ce0d/12688807507.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/uljths4pu13gvr9jmr85re35jr/konuledeseziwutilik.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/vegematigupenamisavowewe.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/38877877383.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e48553d6ff9435bad2832fff645fe29a/89491099092.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/69334423949.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/58591669336.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/dovutebuwubumomef.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/torebowere.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/11054083187.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/21114607598.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/werenibutigejasez.pdfIn PDF document text
    • http://esteel.my/userfiles/file/ladasarelav.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/2451767021.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/18535672562.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_off0000bcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 15864 bytes
SHA-256: 2590a7b59c45b9155e353b149beeb88692f35b3ba003786c84df4928891e1881
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10968 bytes
SHA-256: b8540d582f0a2aaf4fb0d2916fe1953255d5713b86d2932cc93e18573c89fa09

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