Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd9fb3157c64974…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 07:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18c870616293bc23d12ed3e9c6e410f5 SHA-1: 77732c405383a8164c1658ec5045932f91393c00 SHA-256: ecd9fb3157c64974694e0d64f798e6b826526ed8e69c7d3a1a3a3040bb37b6cc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised WordPress installations or disposable domains. The primary goal appears to be SEO manipulation or directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jiendurancecoaching.com/ckfinder/userfiles/files/zuzoxebamekiripobufum.pdf In PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/17289484105.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0ss8fmu3a80s1cq2ui1hcf27f1/82042718207.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48a0e0b03---51822971518.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/83e59135ad2dd6c75af092d6629df2d5/garavisididexum.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070704152470554.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n693009brgpurbhj9ouc5konmp/22552702076.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/87231389508.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ac8f50302a9480a182d217bd130d6250/mafawedalisozupovo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/9258656113.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/zojonosuxe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/khhtu7von6stbpqc8v1oek61q0/67592062957.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/n69faflk664fknlm23stbqdb0d/74572995378.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l14t9p9taccpebm1gldvrr9nr8/talopazetuxegimabe.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/931317c2cf87afd1752200934fe75bd8/sijiwiwevu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/57473233e56a919b6fb3e9f8d5096c4b/vimegarajabumiximas.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfea5d9f29---ditipexunesososulek.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1ca9c9f98aa779936f3f3f93a6a489e7/39935861965.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160877e6b218db---51675170088.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/o7vh48n1lr84171i6m7fkcqeo1/vurutifogudexawoza.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/texefukomifewonexata.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/93274915661.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607741218fa30---jufududefizidepajen.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf63b07bf6---givoxomab.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/6742367229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=endovascular+stent+placementPDF 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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 10732 bytes
SHA-256: 4af6af143b1eb6d28ef42bf795c4c7b2c1b360a1421fe2ac1ed9b490cfb04ff9
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16484 bytes
SHA-256: 07034241281e74fc9bc4f1e114371b1cdfc8a6f359097d73acddce95a57e49ec
font_02_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1