Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b4f7ae5c065d87…

MALICIOUS

PDF

80.2 KB Created: 2021-10-09 23:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0252cef716957cad7e1261029c492d98 SHA-1: 80805018b415dc40953e5825549545da75533ee4 SHA-256: 50b4f7ae5c065d87a3e0a89540dc2c4f0c6749c65be3be0e2f3ba52f68206638
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://glampingcaravan.com/userfiles/file/20210921222336.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/durulelagidax.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/93487236046.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/504710678.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/tozukabobawawirezat.pdfIn PDF document text
    • http://sql110.com/pic/kasafirapevojedebibu.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/jejeduvesuxaxezowetuti.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/gesorosujajokoxede.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/total.pdfIn PDF document text
    • http://sireny.net/share/files/lusireno.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/wifusini.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/33362914655.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/losalavuxositidusezikuk.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/kinazo.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/16368923984.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/29573441699.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616049b8d18fc---nivinixonovil.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/rizonarijereferakazixe.pdfIn PDF document text
    • http://trevorhannant.com/vularexibewukoxunuwerufa.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/57922475748.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/xejeziwatekasozafep.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/bedigeluzorisi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134a8852efee---lodikuzupozidalidowikuda.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/vipituwi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452ed351f36---dobikejexiridulifola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=static+meaning+in+englishPDF 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_off0000ca1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1F 10532 bytes
SHA-256: db6a3d50660cbf8a8fff4b0355de7268ae8e56f3e35507fd2f0a97254aa88c3d
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 21992 bytes
SHA-256: 3aab768731d458038ebc24d38430c689d3ed8463ff017bdd078d761857748b38
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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