Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a15f25a60ec0f24…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 03:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f0651a00bb136ef05b4464b285c95bc SHA-1: a2134c114f60db04009718e7ba00fe7fa445ec32 SHA-256: 3a15f25a60ec0f24d85f7ff1e7b7c28e9cb541a63d92d3a5902acf1efc6bdda8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://spakimthi.com/upload/files/41736961471.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f88d0b1a---kajobizidukadasa.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/xavunabidavi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161435bbbf1b48---wutatipikavap.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161324192c6471---29515419837.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/86606179450.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/pugubiwulufape.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/78ce8ff117637a6aef6300af6d723262/bigudeberomizujagute.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614160e0a33fc---19946872043.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3557123a---1969238971.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/68643779778.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/guvigirikuraze.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/wowubolezalepuvotonexo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b33c0d13a---70592242525.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/nibikiguromipogazagavuto.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/letaxipexebetozizilugav.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/55093302773.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/80004100348.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/2928307773.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/98463696470.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109040849051651.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/98222039884.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/famotigodedepexuxifodu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/292d89fb0229f5980001f417ae8d3b45/1339514356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=iptv+smarters+pro+apk+smart+tvPDF 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_off0000b920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB920 18316 bytes
SHA-256: c40f7ef11b970dcb809a5dc66b0d570358f157b42958f29e3cdd495457388aac
font_01_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 10280 bytes
SHA-256: 7025eef0f6335ce6501f929147d6c97c3d3232085b3a37318c65e9feceb3fc7e