Malicious PDF — malware analysis report

Static analysis result for SHA-256 95049ecfbe6b885f…

MALICIOUS

PDF

98.6 KB Created: 2021-08-21 11:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4ddef7d97393a11b45d383262644963 SHA-1: dab874c8b6b5d2e5af7e9d6bb12816c9e6bafedb SHA-256: 95049ecfbe6b885fda99a1914ee6560d63cf4a8634563af47cdf74bf723d4529
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, while the link farm aims to obscure the final destination and increase the chances of a successful compromise. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 8

  • 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.
  • 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://royalwedding.jp/images/blog//file/ronimegixugasaniboxo.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/449b2f4b1a684c717e076cb243da0d01/gixukisazemakifefid.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4m90ibicuar1dcvkehacf3jvu3/fojatezozadulorinabe.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/27546873139.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ff3d010e7f5df0f7c3a1c06df6b472ad/sasidolejofevuduki.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/536697992.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/3784096518.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/20508030583.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xifelifaraxamazet.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/11732897795.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787cafe219b---ridaduwozigegabemusadajam.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6d95d466---28288200164.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/67111153363.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ee6434b8bb6db3ad9da6328ddb3254aa/40735712893.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac60d00b9---pamulok.pdfIn PDF document text
    • http://dges.in/userfiles/file/razovifogulisosemibezoj.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/guvimamitebaguke.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/16049039826.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/wolipajexibaxisibobu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/7mi7ms1o75n0qofvk641a3d3u1/kagedifazowikap.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/89dea8a4eb533274c3ce5d4af041cb5a/texazebumakusonuda.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/39268110029.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/82749570060.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ak6bm0m1v7667kqd1iu5aaafnt/rovamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=yo+soy+eric+zimmerman+vol+ii+google+drivePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 21368 bytes
SHA-256: 3e3a95247608e599c0c65a07e7b17bd22678e5026a7cd92edab2053049bfe92d
font_02_sfnt_off00015774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15774 10840 bytes
SHA-256: c2895b88ac5ef002aae1281cf4500b9bd48552243dcf478f9e4da832854fc426
font_03_sfnt_off0001704a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704A 1968 bytes
SHA-256: 1b7eb68ad8f5e098d8c0c697c1eec0370baa40878ecdf86cb8b2c86364247bd6

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