Malicious PDF — malware analysis report

Static analysis result for SHA-256 a551526aad2f8dfd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 21:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f93149e32de7250af9a43594e0708d99 SHA-1: cb5cc135bf71f7c25acde112819bd6759ebf57d3 SHA-256: a551526aad2f8dfd855f2182ce25493aef621937be16a3a356b1eef9d862e4f8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous links pointing to compromised WordPress upload storage and disposable hosting suggests a link farm designed to distribute malicious files, likely PDFs, to unsuspecting users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629b31d76---17957554392.pdf In PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tixegeme.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/guzijibewasadi.pdfIn PDF document text
    • http://elskenecologie.nl/files/pozupiwesif.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/84496647275.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/60144162698.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/sipufonosumot.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/30118278149.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8747aca1f---98512456201.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/83212711143.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/91380424939.pdfIn PDF document text
    • http://infosierra.es/images/editor/73136905950.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab19fcc6e0---beledalulalafopa.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/visuxumawag.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/kugukenikanobawog.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/diruti.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/lugarezifo.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/24998036653.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/kexisimer.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/49683787197.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/74928746689.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pojanosaf.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c7f7a881---29890875968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=elon+musk+ebook+downloadPDF 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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 10520 bytes
SHA-256: 0b6c8033ba65ca12083cffa26f75cceb999b9f8c8f837e0668acfdddd7890d55
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 18264 bytes
SHA-256: ec7a983e943153d25c99b559fd123b0c30b2ab52bb1f24fdeb97a9bd9579af26
font_02_sfnt_off0001248b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1