Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c83fad3e46f743…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 09:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4c9ecf562d01de4b4fde311fc6dc6c74 SHA-1: e7c4dda7c9530b6609733394b2feab5d1b9dad82 SHA-256: 68c83fad3e46f743c89979662b9228b5bf021717ffcdb8b9203fb217c7ace869
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malware. The ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=toefl+vocab+pdf PDF link annotation
    • https://bisleri.genefied.co/ckfinder/userfiles/files/67061778887.pdfIn PDF document text
    • http://wdnederland.nl/file/12985449195.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/77002593595.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/gefukimebizuzozogorixewe.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/depijipomenitabemi.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/kujedukumaguzuneb.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/31978621874.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/41578697286.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614119fac157b---vipowazegamogufetu.pdfIn PDF document text
    • http://njxinbell.com/upload/files/wumutopupilulasazelenov.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ce66ff2a---79800905647.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202196238261677.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/snn2bkhj92thd3g3c12in81fv4/wibamoxemufafuveke.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/ludurebulakit.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/54011258361.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/dororixasebef.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8948aa53eb04817d87746ebfbab9d95e/xibeletawerexisiragibok.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/xugupazuxi.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/61709559635.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/pelomeru.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/bogowakixumugujaxaw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d945401f363ab5f9074df09609534dd0/wowirupugiparus.pdfIn PDF document text
    • https://masukpt2.com/contents/files/2461988349.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28826082971.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/39896336015.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_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 10220 bytes
SHA-256: 02e1e805b8e1a26a6ed877fe16ca94e309bdbefe5caefc2607ae3609a2243c28
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 17888 bytes
SHA-256: 508d594f6e3e6b18265b5e2c479c4990244c5abd1cf9d4eb78f2daa25070318f

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