Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeca759cea0e4b2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-27 11:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 148a35ed615644bbd01232cd802f5275 SHA-1: 5f023088d14d8d7ec91f53dd994ced16fd946077 SHA-256: cbeca759cea0e4b2f43b7aa0252f40ba0c76b7ea02c05ecbb6c983fd4d8be82d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, forming a link farm. These URLs are likely intended to redirect users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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
  • 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://ketchas.ru/uplcv?utm_term=pdf+sigmund+freud PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75adcd429---87733375541.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/17387217786.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/wumuzawinujevolog.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/68852595208.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/losedazixegifo.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/46360358218.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/jemamibutejilagakaxadoj.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f91af498---funebizok.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/kanilowelafejagavepevave.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/50806981260.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/sobejefoxo.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/37529107491.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/51400571406.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210904000104.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/43692127947.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/47123470006.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/24974064736.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/liduwoxadomuxubapajujur.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/zetos.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912170602.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23485602700.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/bikik.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/reguwikozilesetexelusaz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d0bb82c29505d7cc4293eea0e31f20ac/62499724916.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/kalolutezu.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/lazivada.pdfIn PDF document text
    • http://compsult.net/userfiles/file/31308658580.pdfIn PDF document text
    • 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_off0000c149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC149 10372 bytes
SHA-256: f1e390a77c0924c9a770c901627e18db32f94eaed595b90b6ca69a6423fac42d
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 20308 bytes
SHA-256: 90b5b518dd56d270d3d7a44108a237d7aa694e63cf8cf95fa9b817af3c29a94a