Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59686d8a305cc3f…

MALICIOUS

PDF

101.1 KB Created: 2021-08-31 01:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 069b76f3b40ea50262420f6bf615f188 SHA-1: e90a5daec9778a51929ed2769bd14f559e593421 SHA-256: d59686d8a305cc3f9f5262a417f3d0217656d32b81d5ff77b68013167fc940d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda80a61146---sosujidezawiruke.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/47bd0df17c1a405a0fb74e31ec7c5a58/suxivobalirowevujixupi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4edbc4d7bbec193a0d6994ac3bf41e8e/zapavitus.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/deruligobevumizemovekuxu.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/titasixasikim.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/75429051369.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/papitefukavofikaka.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e36f4354bca---98568833626.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/topisixogoguwegas.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e523d000---losuxuwuraburugopinexumav.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760463a87fc---zalevelifavuxone.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa1f046b4---rarararaludo.pdfIn PDF document text
    • http://gptools.net/userfiles/file/87222452141.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rhdv2vtm1uilenth02c2r23q7n/33797913940.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/ponevewerivutejozesivusi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701ff2b32c9---bokowabarudunigupikabowu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/leegogskskaha0prammp6v9ai7/xinopanukijopisezemoruvuv.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061410582020.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/13127037194.pdfIn PDF document text
    • https://nasikampung.info/contents//files/47836306868.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/67881289573.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/gebekesivomidilarele.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2dd1a9684---91454916012.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5b8bb899---bosawogakuxak.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/92324397640.pdfIn PDF document text
    • https://samtee.com/admin/images/file/josumirevubapemaxatev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=oligarchy+meaning+tagalogPDF 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_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10648 bytes
SHA-256: 50b6db3452b9329cb496541e2bde03234c8e09b6be1e6c24b3307b7bc4b3cb6e
font_01_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 19492 bytes
SHA-256: f885d8975ed0a683e88c65b8ea468785607b82ce8b4536c769ccfebfda6a97ea
font_02_sfnt_off00016db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1