Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a83a734d118b24f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 19:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47088d09dd8b16a3bde3a2a087dbcc2b SHA-1: 90e314bc47f4239c6545b3bb3c32657e44247bbd SHA-256: 8a83a734d118b24ffbd92b00c1a370816321dbf1f95ac6bb30fa11a4b8832d9d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the overall structure and URL analysis strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://musicincw.com/fckeditor/userfiles/image/pinunupew.pdf In PDF document text
    • http://market-oborudovanie.ru/upload/file/mefigomuzetikexiridujuwi.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/sidunulamevote.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/59140745764.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210903181738605.pdfIn PDF document text
    • http://novafish.it/userfiles/files/52001920074.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/6610873.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/vinisapukuzogizovus.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gigukapowabewonazi.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/38337117089.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/86473704502.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/89778541706.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091809282173499.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a54b93f52---kobejapozenuxuranili.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405deb78f55---bokoleteveb.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/fiwepiberof.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/57901540366.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/47692919481.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q2fkpdrkki7146julj0fosc3vl/50198362032.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/89034899692.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/3506553530.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/11808380596.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/nikugaruzivaletobo.pdfIn PDF document text
    • https://o-dance.com/upload/files/ravasikapupubezerile.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/67084700249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=thinking+fast+and+slow+pdf+for+audiobookPDF 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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 11028 bytes
SHA-256: 8773bd5eae584773ecdf428ac1245b5127dfa7995c795c06c196b37c41c5d07a
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 18216 bytes
SHA-256: f830b55b68f2688f29476124eeb6f794eccf42b8484736683229e609ec253d86
font_02_sfnt_off00012651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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