Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c8676120f07ec5…

MALICIOUS

PDF

64.0 KB Created: 2021-09-05 14:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 990b580341d5e5fb462a62ddea397256 SHA-1: e71c69966d11997a84ddcba9813c33e05d51c97c SHA-256: d6c8676120f07ec5ca412a4848bbd675ce1f3a06b186bb30262f7b978141d2df
154 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

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://ketchas.ru/uplcv?utm_term=hotspots+de+biodiversidade+pdf PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b7f6ef13---jibeza.pdfIn PDF document text
    • http://rld-carbon.ru/file/196620965.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/oan5e18gajrch0dkak2b4id1h6/sudoneraselavazejikop.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273c2f74566---fakokoxos.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/sogino.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9263dce4f---ledugiw.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/2949f38591d2280472e5bff66fac5ec8/89110731011.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/46280359811.pdfIn PDF document text
    • http://ipublicity.cz/data/file/32713345914.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/xutugazipixusuxodek.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/shhltoqu0psotshu12uu4n8pnl/60177607550.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/95226715841.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/72351195524.pdfIn PDF document text
    • http://waterreducer.cn/d/files/45948280239.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f35d8967---gonosakowise.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/divonigifemegival.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/03c232e21b8f722d9bab64f708fa0784/kenemofuxivuvopifunuv.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/60300473745.pdfIn PDF document text
    • http://rentaruedas.com/files/others/mojosogomu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f95a0d19296---peniwenikebe.pdfIn PDF document text
    • http://446888.top/userfiles/file/valis.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089255be71---poxulixolowojawujo.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/mimufimaxebi.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/bokowevujixaliwekexiwide.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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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