Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b99c1e8c38e778…

MALICIOUS

PDF

84.1 KB Created: 2021-07-21 11:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f227cf73a6e61c79f815785bf3a60a09 SHA-1: d1ae14b562c68fd94dc4f2d900748e11f3927b15 SHA-256: 07b99c1e8c38e778ced2927511536308e5025ab9346c3858d795b8b3e0d96f0b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple external URIs and link farms suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ahcxdq.com/uploads/file/280057585265.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nr2r4afjvrkikcvlplrs458d82/zomuwazamolavojorevosaf.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/5458171386.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/gutep.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/15149274045.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tibelupipug.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/91653720796.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/sabimuluxuzojaweg.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30fbbb59e0---zegukisepotomejupe.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d886626eb5bad731aebe4427d5350cda/kubagemozo.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/gekoo7p1k1ako21e0v9109j6u8/88382102524.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/xidoz.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b331d11be---58823223781.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/firotejosatamuzazuwol.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/serenupemaw.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/29769885264.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608067c800d3d---murawu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16081f23d7cefb---18550233387.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/68397680228.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/14340961027.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989c03bab3b---13058299040.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ph2m5jteco7g8k2mcq188dss83/kebofuvutigi.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/ragalutupebivofasebufaxav.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03a1278e4---diralodetetegupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=youtube+mate+download+for+pcPDF 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_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 16836 bytes
SHA-256: e228c9f06d530be8dfc22e2c469707f62b8e82712f8e4034008cb9127bb54811
font_01_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 10832 bytes
SHA-256: c3201474e1c28339006abf0526ee14e9e805accda558c892130eff649f7dd20a