Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf16c5beba5d1ea…

MALICIOUS

PDF

69.4 KB Created: 2021-08-29 02:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c205fd9c2e8020ee56a6896b55ff3971 SHA-1: b77ec2bf5607cf5f786fd599efdc76942062ec86 SHA-256: ebf16c5beba5d1eaf93f03e21883b2377804bdf846de346dced7d88cd2287c09
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its structure, containing a single image and minimal text, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish credentials. Although no scripts were directly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa022a595ff---fugetizovibiron.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e31c2fd217e---sufuridedatiludeto.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wavogemexenenozer.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/bepedujabimawiso.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qljj9amuv0cidhh9u6qa5ii1uv/21233555625.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/13437987477.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee91576ded---temov.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/22486593335.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/wuninunazevokogapoxivivo.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/zowetel.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/78698641613.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7ca4d1454ccbb3a63e2416f8d22428ae/wutelazokik.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zifomodozizekogejomisom.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/296f2aeff8ef2328b7475a308b246746/83980961919.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe75aeee363---jixuvapujabezaxiwubev.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c69e2a021---boxadometagez.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/53980167968.pdfIn PDF document text
    • https://topupdana.com/contents//files/vekinemika.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56534203298.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/82550768719.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/jaloz.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4db5e6be7e---82322571221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kent+state+directionsPDF 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_off0000b68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 10308 bytes
SHA-256: 489be3d096ff8b1465910d45a304c0d5f4c91712bdaca60b8d9568e0592e6c99
font_02_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 13804 bytes
SHA-256: c77df1d5b364c0d350111b400212f478fdfe78049dbf3c2836ebb113082c8004

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