Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb4c310eaa84ac2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 17:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ca33cf7b41efe31e9e08b19373405573 SHA-1: 9ad2de375df0358509a5abb7ba5d4afa7f4f7203 SHA-256: cfb4c310eaa84ac210d171e6e4387c3cdc01e5aee34c4f9d4161f317547fcef5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for obfuscating malicious links or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://docando.es/js/ckfinder/userfiles/files/3812899980.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a05ed2e08---ruwemasutisaxel.pdfIn PDF document text
    • http://gaudi.tw/upload/file/rigoxizefavokamegotugi.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/98036323978.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f45d85f6d86932870b9ea8b7f0b357af/56774659281.pdfIn PDF document text
    • https://airbays.com/userfiles/file/74307241816.pdfIn PDF document text
    • http://bwc.lt/i/nelosefozekurumumovom.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/xawanitup.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/ropanojoxakes.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/juvud.pdfIn PDF document text
    • https://ksboutlet.com/file/files/mofeseveziwonufav.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/vimesi.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109180705019285.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/5036695358.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/temezizufojovozup.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc78c4e2de---78019003232.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/bokofipisusuri.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/35627413999.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/4933226133cc4f29348.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210913_CCC85D1FE4A8E7AE.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1f435cd32bbf707d24acb432b49b455b/91480284594.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/dabirajosepasajijegav.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/65647442237.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210917132317.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/89480878839.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/86867896674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=example+sentence+of+modal+verbsPDF 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 18944 bytes
SHA-256: b61184b6d707282817ed5ce4a9948c9b517af91c8ca72a6dafbee6ada72a20fd
font_01_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 10980 bytes
SHA-256: 071d62f9dc1219846693cb5ca5cdd389848785e3df8b82c9e486de8ca78bd0d1

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