Malicious PDF — malware analysis report

Static analysis result for SHA-256 558946287fb1893f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-02 22:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 977efc97fa384e7976a01bea43ff4167 SHA-1: 72097e1a3dd4577feaf6642e51077651c01524fe SHA-256: 558946287fb1893f7a9c4a15a1af3ecb43691d773952106ca634c7cf69c58f33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://cructi.ru/uplcv?utm_term=health+care+connect+ontario+pdf PDF link annotation
    • http://nbc.com.vn/ckfinder/userfiles/files/78863486466.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609470f5349d4---xowidowovura.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ac1b991f---95738803750.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad4e26999---51937673033.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/fitonajosoxomefezumudat.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/97711422209.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/biwagemulevifude.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4db7b6oj10gk87m2pn8vpvb9o7/jenogu.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/53573001219.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a82a2c8a---58742740221.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160946886e01ac---sowaxurijimurudana.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/53659654982.pdfIn PDF document text
    • http://polkovnik.su/upload/file/zojarosokil.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a090be23d0e---97403171359.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1ab4ee639e5127a3d5da8ec239e210ef/wobirisuvuwotozeme.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1151c3c725e51913caf6dffd7fab04d3/moluxal.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac841d1c99e---71984398424.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/budepuzamaforobifijo.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/41249356341.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6kg7s8memoq9gmthmig2832n0c/nawusawi.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/dudoridodi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9fuf4tf1qcp8kjs8lci3readhp/80245103682.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13d01cedd---salezenirapu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160771705f224f---vuduvivetesonibag.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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 14324 bytes
SHA-256: f2140c769612c480e29d29d4394ec4eae1b591e25e3ecdf0cb6bf6b60281d978
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 10540 bytes
SHA-256: 7a1b497c6f3b7d9e1e8d3dc2d877b7c6c157e1c88562c3274ba8becc334c4871

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