Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b430985952d4f…

MALICIOUS

PDF

73.5 KB Created: 2021-07-30 03:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a13f555453b79b84bc969369638335c SHA-1: 2166f5afdea24664bb6792581354f782016ded66 SHA-256: 815b430985952d4f450ed2b1823cd35e441e4c92ab8e5032e7d13a1b20d25975
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to other PDF files, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9355

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://oniceh.ru/uplcv?utm_term=fragile+states+index+2019+pdf PDF link annotation
    • http://ps173queens.com/clients/10779/File/borapiwidaverujike.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7030a387df---netufofuzaruj.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/25815952813.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/5608949487.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ae69f713650e1d6565892af11b2f94a6/jiweropifa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c52dff170a2---2967918458.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/55291493226.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e067e644---60153531473.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af347884134---jajeteronefamumigevepizoz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/50269a4e894a136eb5385a020eb15973/73135499051.pdfIn PDF document text
    • http://www.puhito.hu/uploads/kifodimudalojoniselotadu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9cec79ff---bokovetawanexisapujeb.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/84223385265.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u826pj5ggss6ooaeemagqthi36/gupawagus.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/5139679886.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fagobuxajigij.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96da9cb54---rinokomili.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/21807392773.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/rafekuju.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/sareferawoxapepa.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/49950229492.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/740ff4cd69ac7556d7488a08a2922971/96432775035.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/xipesumozovazol.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/nagepolinukezafezexevidep.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bb0382a0d7ee8053d20bc68ea079129e/40574170414.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 11096 bytes
SHA-256: 0cc877fae437cfc2e48297e74d7fe78c3dd46a346a941e5695dbad5f1aa2a807

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