Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1510dc1a2f3ed1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 04:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f33df3038a7fdea7f54934b9f704464b SHA-1: 2d6bfcd9afb6f190c277afd041d299b7ef7efe4c SHA-256: cb1510dc1a2f3ed14a07581e8abb94a08dc8e0fd59ac278c97d46518d70dfbdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be to lure users to potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://myclubowners.com/userfiles/files/17135467862.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ef1f922d3936cbe51a89976189377017/95734535394.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/madidozagudemajeduxi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/845108378.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/061009a5f93094b41b1f56a4422ee255/54286408317.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fs7d9si35dvg26gjgf4qidpm1n/xiwosezokivebakesezev.pdfIn PDF document text
    • http://elma1.ru/!upload/files/zovexiwirotovizo.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/94114316902.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/7044764911.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/povugowuba.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/ganaxetum.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/guzedevafowawazamebukon.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f1838917c43225f693ccbee0e166a9d4/domefe.pdfIn PDF document text
    • http://salespate.com/userfiles/file/75150863153.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/23260554059.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/likevuxasolaliwam.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af7ede695b---57954236311.pdfIn PDF document text
    • http://mweb.cz/images/file/wixebatavozudake.pdfIn PDF document text
    • https://medpressa.ru/files/file/13024213832.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/88993669064.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/24968936207.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a995c434d4---gizefefokatuzatig.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210903231818.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/nilijigisusirupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=multiplayer+games+for+android+bluetoothPDF 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 extracted file (font_00_sfnt_off0000da2c.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000da2c.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 11292 bytes
SHA-256: f9621c55f2228d2f1c8d7bf59d9be6a83185f533f0be3f19038452ba1ff8b0c9
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 17504 bytes
SHA-256: 9716c8a4de32205900c233801f9e246ccb8d7b061d894a80fb046422a82b1eef
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1