Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ce366e2f247f61…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 06:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13668e3f166fe66035264256c4192a74 SHA-1: 5a5c56c5b92431191c0d0ea329df9bbcfa99bb3c SHA-256: 03ce366e2f247f617ad27a63c3e25fb95045d712fe794aea2137677a917d50cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links. No scripts were extracted, but the structure and URL analysis point to a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://schokobrunnen.com/idata/57064550866.pdf In PDF document text
    • http://ambulanceservice.pl/userfiles/file/nojiwebivuxupibiku.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/bejizepududetezikaguke.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/30809912561.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d7pmv06rsqlh2qinmnqqte5dl1/75457302072.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l8n6shh1ssqcpjco3tab78le36/74672088977.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/94330738052.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/96578245053.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad938053761---2006608797.pdfIn PDF document text
    • http://cabini.it/userfiles/files/vexowesosazuze.pdfIn PDF document text
    • http://gabortech.comadmin/file/55689901617.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/655e6f8e56f64c918d1f10f16669b292/milujexajimutomofuwal.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6270095b---86622269356.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c947007641e---43675009486.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/zuvufewefozakalejojuruje.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/97776788196.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28f3629b2---2423862806.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e453c7f2---tizozuvagisif.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7125250c6e3c609cfd4e97a1ae01d11f/58442106842.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69f11058a---numonamivoxoru.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/mobekufujajalu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/u0t96a6vf4chh4csfrpplmiqp0/97345651953.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/pilumolavum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=can+covalent+bonds+form+between+moleculesPDF 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_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10968 bytes
SHA-256: b2307c2cc1d545bf2bba76a05e4996900af5b0cc57544307e17a0fdb64bfb3b5
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 17880 bytes
SHA-256: 9758ebb627bec31979fe1f921dcd2ae79d5630b7e57549cd0bad709b449dc9d9
font_02_sfnt_off00013b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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