Malicious PDF — malware analysis report

Static analysis result for SHA-256 b644d2f5d9a178b1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 17:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50c7ccf7c651a1a1ae75f4108f89e6b0 SHA-1: 6e5d2d86dea905fa30071ecdd5473b34bf31e22c SHA-256: b644d2f5d9a178b1c1595c8736f5d80d92977336e4a422be4826c372b6297bf8
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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.
  • 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://watfordfairtrade.org/app/webroot/img/files/zedasineweforapap.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cce5189e---tiganalapakug.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rf8bdviic1sl497gokeu2pbdl1/80829970274.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/40199398242.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/10749463671.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104740252286---vesutibosuwiru.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/sewozupowomokifoj.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/37149327996.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/wiguwuwus.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/muvosukesazomu.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/feguw.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ilof6iptjbbmooadd7m4ess56q/manerolamepipexeke.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/41236414090.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b371558a785---43657323332.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48e60fb32---nekufibovufigokejebaz.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/tomijodebuliferutugi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8c133e1664953e7a92d6649ea34b23a2/29371115662.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9afa35b04fe2d8867454f37221f00b58/lupum.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/rekabakule.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607570aa27e24---nezigibumumiwijivi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611db769b33d7---90098235524.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tna9p5efs210acc3mc8hufhrsd/61038735778.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/mojeboberakefazemozaba.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e26b91e4f---dagesalufuxakozuxaxig.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/jekijoxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=literatura+espa%C3%B1ola+moderna+pdfPDF 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_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 10924 bytes
SHA-256: 5ee824b3c85eb01b2608578ab609a5433026228c9c072a1dc44bfe9d27595c74
font_01_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 18348 bytes
SHA-256: c8a7fac74c43ff0a8dba33622a1f17bb6a17ec9b6444dabdd4acb93e8f57abb8
font_02_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1