Malicious PDF — malware analysis report

Static analysis result for SHA-256 163a7accbce452c8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-27 19:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbcaea9e2fb99b686abda05e802068d1 SHA-1: d5507024e933d37651b485958cf423e71d1f3d33 SHA-256: 163a7accbce452c87b64dbefc33ebde622ca946a99f63f183b3ce4f49d5949a5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://planningpvedh.nl/ckfinder/userfiles/files/moxubap.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/tabijoparetisadere.pdf
    • http://chanhungcorp.com/images/uploads/files/daropux.pdf
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/46741911215.pdf
    • http://melabo.com/upload/files/pejopodibilekowogine.pdf
    • https://devcons.org/uploads/userfiles/files/65435110197.pdf
    • https://makenie.com/upload/files/44769023953.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/534e5f51496246ed86a8e6e7a4ee2229/1718144717.pdf
    • https://forexinc.ca/upload/editor/file/pefaguvonowanoditeki.pdf
    • http://sungder.com/upload/dofajitufunob.pdf
    • https://kingdom.vn/userfiles/file/25492631900.pdf
    • https://bcm.es/files/galeria/files/soxuk.pdf
    • http://wujipacking.tw/upload/files/modulujobatezirebosojujid.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/cdq8abkvu0d8c70ulkken203p4/bowawiw.pdf
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/vukarefotulunudedapedojuv.pdf
    • http://due.pt/js/ckfinder/userfiles/files/wemevikinisiw.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/88c7b21a6a8ac2bdd112703011427247/dokojalalemixivukito.pdf
    • https://hasekei.jp/userfiles/file/87457358979.pdf
    • http://location-appartement-venise.com/italie_documents/files/fefuximozigininasezedowes.pdf
    • http://www.majbrno.cz/uploads/files/paginapumuvoniporede.pdf
    • http://clinical-pain.com/pds/userfiles/files/76615828439.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/nowawexer.pdf
    • https://alnahamgroup.com/userfiles/file/vuluzexipotadinamu.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/worilewafesukonekubisat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=change+image+size+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85f.bin
5333ca82f70514e4668033e52c525c664e25a2e617a6338d72135b8fb2c720bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 20080 bytes
font_01_sfnt_off0000eb09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 16792 bytes
font_02_sfnt_off00010320.bin
8ba02913e955ba55ec61235065e08dbe675e9cfea269cebed870d5fadc546983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10640 bytes

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