Malicious PDF — malware analysis report

Static analysis result for SHA-256 efadab2760dc5e31…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 21:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5f39484714f5a63cd9bcc86178785287 SHA-1: 80195a4f3528a7f707606066fe1c8af4e94fc57d SHA-256: efadab2760dc5e31f8f63345512fee99bc7d70b11049188054a08aa40f8bfab0
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/828f98bd626bf28ab86cd30bae2e3c24/pasuguxofida.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2150f043a---45419056364.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/2939739669.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e02e9b7fc---66396697138.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/29298142535.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86f0d57e9---gofisukekepuxojexu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160853b238547b---tawakidipudukubumazixes.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/611f6b8efe7320bc6c644803a637ec7d/7278318866.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/24533342183.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/seposikabolijadizogope.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/35119477476.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5844ae12---20672816105.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b56638ecbda---22752309374.pdfIn PDF document text
    • https://cristalensi.com/public/File/silamifodavo.pdfIn PDF document text
    • http://www.infos-lentilles-de-contact.com/images-sites/files/68490101725.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/9275770689.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/lowepisujojizifilerajaru.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/dikinovivanane.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/75430996116.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/35963485176.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/zolosivufajadapazivizobo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864ad98d44d---rogemu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ce281649---20832775599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apps+to+download+tv+series+for+freePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3f05cd501---nimibelujusazupojas.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10624 bytes
SHA-256: 24a724110ceb6fcd027581f1da8ed6a1b0bd8b20c03c8f9ef1ab2ec4ad3b56ea
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16928 bytes
SHA-256: 2fc8ab36be49364d7d705b5f36aa4815d1379526c14b01613a307837b3abf75e
font_02_sfnt_off00013446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1