Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ef8da6a41b56b3…

MALICIOUS

PDF

86.1 KB Created: 2021-08-21 05:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57a3d973012f1a7887a23b2d8a5b3731 SHA-1: 3a086bab59e3e94ff8cc751d2a71154cd7bce9f5 SHA-256: f8ef8da6a41b56b36b0312b675a5cf7caf5a1dc414a8a5342e7f2c8b59d887c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, including compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=ingrid+goes+west+script+pdf PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bdcb044ac336d0afe97c721f7d8b7636/27679672465.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/99240909538.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/61978798869.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/29235726331.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/97534351058.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/bubobusikofuwamavinekag.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f8ec6dd0130cd153148236defc77a5a8/kisojaz.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/dopixegafirumepesikip.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/29319231817.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/bijinudogezowewego.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be73d7d94c1---3498817140.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7nesbmvt55tifmafise9buuio1/85449476412.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/24559306480.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/28441103495.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/53c3a4ac49970ef7d35240f0ed29bc48/buketikepipuv.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc13dae266---67174716136.pdfIn PDF document text
    • http://azizolace.cz/images/file/fomokibev.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161119d5202043---76304497640.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d461870f1bd7349fab470246c8cc596a/xarosikasidejejuv.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/funenexujupun.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/wevekofibijogod.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/32416975065.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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 17100 bytes
SHA-256: 86465d83bdbbb8a2b1f22a603b21e4fec4b5e5a8ffa875ef45a395fe600c3363
font_01_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 10624 bytes
SHA-256: a19102bcd9d4dd1f0c114389fbefe063d3b15918e4c333f7cb4cf89ff99e61b9
font_02_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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