Malicious PDF — malware analysis report

Static analysis result for SHA-256 544eb0e6510942f3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 12:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b179274fd21751ff30c8362bca58fa90 SHA-1: 4f4f7ad5638c74e18726e5b8fe1e52bc19167458 SHA-256: 544eb0e6510942f3f3d4a967986549826dad19e3b26859cac17fa87217c5f7f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://davidlbrooks.com/clients/868292/File/zozobejujopokutove.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/pd2dfrr7k75nqodn8vnm7ck8uu/zoponipozasetan.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/33709303749.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/ravolubufutufove.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8b542fd6---1231870530.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/9582080684.pdfIn PDF document text
    • https://sealskinz.ru/files/file/komixiwuma.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/19470796248.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/tuwobu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bda70e9664e99ad86132af17489d3594/12611113136.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/75352859973.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3804b86c901f1766504874e51ef978ee/bejupalinuzejagula.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/62a136f02cc4a610bfdc5639813cd45b/xetodel.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce98fc58648---nokotizizibopinuvaz.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/50845638034.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/65157488476.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/zibufejadijabawaf.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/r1jl4jp8fnntrb519mscakn0dd/busokat.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/46414220302.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/74gun13msorsl2nve9pjug6du7/vajavobebawiwixiwoxe.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/kesexu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b880a15e8e---93604817214.pdfIn PDF document text
    • https://stvorki.ru/files/file/59873674949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+armed+forcesPDF 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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 10448 bytes
SHA-256: ec6be2c9f843c70cba277dde58c9afd5ce8bdebc122b85e13647d776d40cf974
font_01_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 17140 bytes
SHA-256: cf0a90529ed37c48d17c71d62c99eea0ff45b7d8d6ebd15341991eb6acb331de

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