Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b970264a3f938a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 15:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2d5cbd6c8bc37a01f1baefe1876a004 SHA-1: 4fa2cfb51fc83ad3d0fde00a0199cbd4c6918835 SHA-256: 75b970264a3f938a508b02211af84752219a7c954c58d613942411e2f23eb447
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate the redirection or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or trojan distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=online+puffin+browser PDF link annotation
    • http://sor1310.com/userfiles/file/39045961824.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/26817210925.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/xixunovegelugolabimuxi.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/dizewazimuparagoba.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/safodi.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/98469340061.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/37754538818.pdfIn PDF document text
    • http://vswet.ru/f/vosejirusokijas.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6384fe1---sawujuneno.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109130929458286.pdfIn PDF document text
    • https://rm-parketi.si/uploads/papoxomejiruta.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/98339168602.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/bedaritazejofiso.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/70276151240.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/biximabosujogiguwekij.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8477br7nk38es7jgia04o29lt6/10596369880.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/jufomi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56b10633d---99774376037.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/49785260059.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/51720631500.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161418debbdd50---73546989805.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/44035875313.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/53830617553.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_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 18132 bytes
SHA-256: 843a25130d797021c5b2fe238f6b89df5e2a0ad5673311de9dd3037b5460fadb
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 10440 bytes
SHA-256: fa657a81ef515ca3ba473a14e642f13bf6b87e71738a6fba4af2298ded824d42

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