Malicious PDF — malware analysis report

Static analysis result for SHA-256 9279e97b66a838d4…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 13:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5540b8e4dda9535fa16da7b55a458bd8 SHA-1: 04644749a832343064ccbeeb94dd7212c9518ebd SHA-256: 9279e97b66a838d4932062a3135ddfe6e125425547135412f675c22a29166663
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://sfera-vlad.ru/img/file/10659720526.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1ccf5eb5a144f6c1866cd8e264264ab7/7737986566.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/31690534827.pdfIn PDF document text
    • http://coffee33.ru/archive/file/20525911020.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/63433219058.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab4d8f22a---wosur.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3973a970d---rogodakelinemupudefeg.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/7625880276.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3f84c34a1293edf798dedc4283cb1ed0/koxixewoxosug.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dabopisomopidid.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jupusetometizikotulijaxa.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/874fe46386b8523a34d48985d084bb4a/dezizavafamipobifokogafi.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/41778019566.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e70a23049c8---6033633628.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/zipuju.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a3c451975ff69e4c127d447318080d5e/21214380479.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6f9652d9---89219189300.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/61933162742.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/51365587708.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/30904800975.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/42458049428.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/70941819026.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/60161464764.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b773e3478d3---88465666597.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4926166cc7---91385899962.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf966f11e1---benokopidebomanuwapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+reader+like+a+bookPDF 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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 17188 bytes
SHA-256: 2e2b2c2883072b91bde081e679ba35f43b086ff4b9e5b5b3dc6756d6f3a54d6d
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10208 bytes
SHA-256: 66432a071e5e0d2945577cd9f3634c93008f0df29cb280b7d3a876a1fadcf14d
font_02_sfnt_off000132b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1