Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fd91d42e79bf54…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 12:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 744f02c40fa7a8f8e3c029a20e841946 SHA-1: 8cc416951a26003a8c39d2723d34740c6dcfb5e6 SHA-256: 21fd91d42e79bf5473062c064a3ba2cb0ee5b3e6fb0526feee9f979681f5e29c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript is likely used to execute malicious actions or redirect the user to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • 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.
  • 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe9916f0c---76913261133.pdf In PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/59874027645.pdfIn PDF document text
    • http://allier-genealogie.org/File:/30986672751.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/zidewudififep.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139366ac30ea---vesujusuxenakusu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/125b7e2hieie72meaf2ru2c7b2/zunekenoxixovoj.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/reselotiben.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/zuduvetutivigasobuwanunem.pdfIn PDF document text
    • https://rcot.org/userfiles/file/44454055611.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tokpv2k4suuftg4qf8oanahsd3/gizemotivunebalemijonufa.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/30759451891.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/12284964715.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/89244435006.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vaxiniwuzek.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/vugiw.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/28475104050.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b7e60067---wilufavukizinevoluwixaxos.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/gujidavitesorokewof.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/gijepavenavadeluvit.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/xuzox.pdfIn PDF document text
    • http://polipack.ru/content/file/mogakekusipovufiwe.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/82042599943.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/56252263071.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/mowadaboxewaweremuwidinir.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210907083803_wm1e9t.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/33621775446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wifi+hotspot+apkPDF 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_off0000cbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 10160 bytes
SHA-256: 9bf0b5237f02e06ec5ee225515f27b26f13b6157c009f5d0e3d1762a969b1d60
font_02_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 18160 bytes
SHA-256: d2666d14c19bcaddb97f8fb5f198076491137df5d93261ba613a3e1f3ff9740d

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