Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d8ce137aca951a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 10:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea503881cf88904cfebe039fc584e5f1 SHA-1: 00fc295da689c32ddc3274b599fc21254283bc1b SHA-256: f6d8ce137aca951a7ae3577afdc939168cf82e8cb24ad4c5c08a5240f1dc98b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=pc+automatically+restarts+after+shutdown PDF link annotation
    • http://reunionclass.com/clients/7469/File/pasuxavajofejuluziv.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc88bcfae---xobugomitaza.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb272e51612---21835562535.pdfIn PDF document text
    • https://olterus.com/contents//files/fixobabo.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/midepupazufopevefuwelipu.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/32243301248.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jcoq7cnt8mj61soci1aiaaidc3/wimakurejilute.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/zanis.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/58521584474.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/sotar.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/13591654010.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/dufofaxufifokojexesad.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/44006812017.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/91733401995.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/funinagusemotez.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1a808ae67e225c0e23510ada9065b033/bosere.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66465812050.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc836fd1d---fusaminovew.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3e3bbbfc843232dcbe8eaed8fdfa7f8b/rinawinozajemer.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/koruresezekubotegutomut.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/3180937616.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/85018634228.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/wugabaxusazup.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984791181c3---53608386436.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56e6ab65e---61965429204.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e7d1ba62c---91612409058.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/da97ea9ae76a645823f3c257a360b941/83478946240.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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 17160 bytes
SHA-256: aebecdf41de1730589f72f3009b86d11a84993082278fa975707e6d45fcd748c
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 11044 bytes
SHA-256: ca51ed988f3bc47dece08337c272ecc6af82a8d63c1a58795056f8918ef8f8d0
font_02_sfnt_off0001139a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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